—*«P"fcrt^^^^W^"^^^"

INVESTIGATION OF ELECTRON IMPACT PROCESSES

RELEVANT TO VISIBLE LASERS

0 C0HCLU»tONI COM _0.^| TMOII OF TM« AUTHOnt AND IHOULD

AL P0L1CI«i. «ITMBU «UPLIItt. 0^ T HI AQVANCtD K«tl AOINCV M TMB U.i. ••VtWMMBNT,

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o

M. John W. Boness

Avco Everett Research Laboratory, Inc.

Everett, MA. 02149

April 1976 Semi Annual Report for Period 1 September 1975 to 29 February 1976

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FOREWORD

Contract No. : N00014-75-C-0064

ARPA Order No, : 1806

Program Code No. : 5E20

Short Title of Work: Lead Atom Transition Forbidden Laser

Contractor: Avco Everett Research ^b^tory. Inc. Everett, Massachusetts 02149

PHncipal Investigator: M. Jota W. Bo„eSs, (617)389-3000. Ext. 451

Scientlftc Officer: Dlreetor, Phy.lc. Program, Phy5leal Selenees Division 01 Office of Naval Research

800 North Quincy Street Arlington, Virginia 22217

Effective Date of Contract: 15 August 1974

Contract Expiration Date: 14 November 1976

Amount of Contract: $402,488

i

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REPORT DOCUMENTATION PAGE I. REPORT NUMBER 2. GOVT ACCESSION NO.

4. TITLE (and Sublltle)

INVESTIGATION OF ELECTRON IMPACT PROCESSES RELEVANT TO VISIBLE LASERS.^

7 AUTHORf»;

M, /John W. Boness

READ INSTRUCTIONS BEFORE COMPLETING FORM j

3. RECIPIENTS CATALOG NUMBER

Z> -J RED 5. TYPE OF REPORT & PERIOD_COVE

Semi-Annual ^(epfct, lSept^^75—29 Feb^^976 6. PERFORMING ORG. REPORT NUMBER

9. PERFORMING ORGANIZATION NAME AND ADDRESS

Avco Everett Research Laboratory, Inc. 2385 Revere Beach Parkway Everett, Massachusetts 02149

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Advanced Research Projects Agency 1400 Wilson Boulevard Arlington. Virginia 22209

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Office of Naval ' esearch Department of the Navy Arlington, Virginia 22217

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18. SUPPLEMENTARY NOTES

19 KEY WORDS (Continue on revere» aide II nece»»ary and Identify by block number;

Electron impact cross sections Visible laser Metastable level Electron spectrometer \

20. ABVWACT fContynue on revere» elde II neceaeary and Identity by block number)

""^The program objective is to obtain electron impact cross sections relevant to visible lasers of current interest.

These measurements include excitation of the upper and lower laser levels from the ground state and also excitation from metastable laser levels in order to determine mixing cross sections between the lasing levels.

V

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(20.) Parallel experimental and theoretical efforts are in progress which

when combined will yield absolute cross-section magnitudes in the energy range of interest, 0, 2 to 20 eV.

The experimental program involves the construction of a crossed electron and atomic beam apparatus. The diagnostic employed is energy analysis of the scattered electrons using an electrostatic analyzer.

The theoretical approach is to develop the mathematical details of a pseudopotential distorted waves ^heory in a generally applicable form so that it can be applied to the various i iecies of interest.

During this six-month period the program has proceeded according to schedule. Fabrication of the experiment, including vacuum system, electron spectrometer and control circuits is complete, and final assembly prior to testing is imminent. Initial measurements will be performed of known cross sections in He in order to calibrate the system. Thereafter, the metastable state excitation mechanisms and measurement techniques will be initially tested using the noble gases.

The theoretical program, which is a six-month effort, is currently underway.

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TABLE OF CONTENTS

Section

I. INTRODUCTION

II.

III. PRESENT STATUS

REFERENCES

LIST OF ILLUSTRATIONS

Figure

Page

3

EXPERIMENTAL DESIGN & CONSTRUCTION 4

7

15

1 Schematic of Crossed-Beam Apparatus and Electron 5 Beam Metastable Excitation Source

2 Schematic of Pumping System and Vacuum Chamber 8

3 Photograph of Pumping System and Vacuum Chamber 9

10 4 Photograph of Stainless Steel Vacuum Chamber Showing Side .Access Ports to Metastable Source and Electron Spectrometer Chamber

!3 Photograph of Stainless Steel Vacuum Chamber Showing 11 Wheeler Flange and Vacuum Feedthrough

6 Photograph of Electron Gun and Hemispherical 12 Electrostatic Analyzer Mounted on Wheeler Flange

7 Photograph of Electron Gun with Shield Removed 13 Showing Various Electron Optical Elements

pwi'uw

L INTRODUCTION

The motivation for this program was derived from the need for data relevant to modeling high power, visible gas discharge lasers. In parti- cular, data describing the low energy behavior of scattering cross sections in refractory or highly reactive materials is conspicuously absent from the literature, presumably due to the lack ot compatibility of these substances with the equipment employed for the measurements. Specific examples of these two classes of species are metal atoms and the halogens.

Where the need for these cross-section data arises, the approach often adopted is to sc?le the cross sections according to their optical os- cillator strengths, howt-ver, in the low energy regime of interest several effects can render this a very poor, if not totally inaccurate, procedure. These effects include contributions to the cross sections from resonances Q]

el optical oscillator strengths. Furthermore, the electron impact cross sec- tions for so called forbidden or non-electric dipole transitions certainly do ti it scale a vrding to their optical oscillator strengths, and, in fact, it is well known that in the threshold region the inverse of the oscillator strength seeding pro eaare would be a closer approximation.

Lnese enects inciuuc cuiii.i.j.uu.i,iuiii3 <,<-. m«- ^.^^^^ ^^~~* )r temporary negative ion states, which art know to dominate low-energy electron-atom and electron-molecule scattering*1' and are not related to

A category of processes (as distinct from species) which has largely been unexamined to date, due again to technical difficulties related to gen- eration and manipulation, involves electron scattering from excited atomic states. Metastable states of the noble gases which lie close to their ioni- zation continue to play a critical role in determining discharge stability in high power, rare gas halide lasers, suchasKrF. Since the importance of excited species in high power lasers is well recognized, the ability to mea- sure certain processes of this type was incorporated into the experimental design. In the case of noble gases, discharge and electron beam excitation schemes will be employed to generate metastable atom species. For re- fractory species, the excitation scheme will be confined to the electron beam technique.

A number of experimental difficulties complicate the measurement of accurate absolute cross sections, when using the crossed beam technique. This is particularly true in the case of condensable vapors and for most metastable species. Such experiments generally employ normalization techniques using know cross sections in well understood systems, such as helium. However, the technique requires a measurement of the background gas pressure generated by the atomic beam in order to normalize to the known species. This procedure is clearly not applicable to condensable vapors. In the case of metastable species, the difficulty lies in assessing the excited state populations. If secondary emission coefficients are known,

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Auger detector techniques may be employed. Currently, however, data on only a very limited number of species are available. This technique is also limited to those metastables which energetically are capable of 4 inducing electron ejection from metals, which implies energies in excess of the work function, typically 4 eV, and therefore severely restricts the applicability of the technique.

In view of these difficulties, the decision was taken to perform a parallel theoretical task which would yield reliable absolute cross-section magnitudes at relatively high energy (>50 eV) and to which the experimental, data could be normalized. By confining the theoretical effort to the high energy region, complex resonance interactions could be neglected, thus greatly simplifying the theoretical approach. The proposed theoretical approach involves a pseudopotential distorted waves method, which is novel insofar as application to forbidden transitions is concerned. The proposed program plan is to develop the mathematical details of the theory in a gen- eral form so that it can be applied to the various species of interest. The pseudopotential distorted waves theory will be applicable both to excitation and collisional mixing processes in complex atoms.

II. EXPERIMENTAL DESIGN AND CONSTRUCTION

A schematic of the experiment is shown in Figure 1. The experi- ment employs the crossed-beam technique whereby a low density metal atom beam is collided at right angles with an electron beam of the appro- priate energy, and the intensity and energy distribution of the inelastically scattered electrons are measured using a hemispherical electrostatic elec- tron energy analyzer. The electrostatic analyzer is rotatable from -30° to + 145°, thus permitting measurements of the differential cross section to be made at a number of angular locations. When integrated over all angles these data yield the total scattering cross section.

An electron beam generated from a thermionic hot filament electron source is focused and energy controlled by a system of electrostatic lenses. Since only the broad features of the energy dependence of the cross section are of interest, no attempt is made to define the energy spread (resolution) of the electron beam beyond the natural thermal spread obtained from the heated filament, which, combined with the voltage drop along the filament, yields a half width of approximately 0. 2 eV, characteristically.

Those electrons which are scattered into the acceptance angle de- fined by the electrostatic analyzer entrance optics are transported and focused in the entrance plane of the electrostatic analyzer. After trans- mission and energy selection by the electrostatic analyzer, the electrons are detected by a channeltron multiplier. Pulses from the channeltron will be fed to the input of a unity gain pulse amplifier located immediately on the signal lead vacuum feedthrough. The low output impedance of the pulse amplifier reduces pick-up problems between the channeltron and pulse counting equipment. Standard nuclear pulse counting equipment is employed, which consists of a pulse amplifier and shaper, discriminator, sealer and ratemeter. Since very low count rates are anticipated for the metastable

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* . 103 channel signal averager will be employed in atom measurements a '0 ^^ (- statistics by repetitively sweepxng ^ H^Tec^rSfrgy rauge of interest and storing successxve

Sweeps in the memory of the signal averager.

l ehe objective of the experimental program is to pro- As mentloned' '^"X^rements whose accuracy is not energy

vide relative cross-section measurcm scattered electron dependent. This requires d-;f^f^^reharacteristics over the range beam optics ^ possess constant ^nsmx^on ^^ ^ and e

of energies of interest 0. ^ - ^ e . lenses whoge focal

entrance optics l^^t^VX^ ^ ^^ ^^^ ^ properties have been accurately cd.x been confirmed experimentally.

Eve„tuaUv the transmission ch-acteHstt . of the .yst^n, w^be

determined by measuring the ^'^ "^^/Sü'hed the aecuracy Agreement between .xperxmen^dtheo^^ of this cross section to Letter tnau J P

»afp for slieht geometrical misalignment and for In order to compensate for sU?nt ee electron optical train is

residual stray electric and -^^J1^^^y^fl^to/plates to cor- equipped with four sets of P6^^" Rectory. The bulk of the lab- ^-^^^:Z^;^^^ vacuum chamber with mag-

netic shielding material.

Ml of the electron optical ^P=tS inc .^g ^emis^ical

analyzer, are fabricated ^^^^^^Viles for high stability electrically stable in most ^fff^f^'J^ eLments are insulated and

Excitation studies from ground ^ate^aseous species utü^e a

simple molecular effusion ^f" ^'^^^s from metastable tares to yield a well-defmed bea^ ExciUt^n^ * ^ ^

levels require an initial ^l^^^^Zn are well beyond the regime species. The energies of the ^^^f^ sophisticated excitation accessible to thermal «^^^/^^arie^ of possibilities are available: mechanisms must be ^P1^^' rtP eStltion charge exchange processes, electron beam excitation, f ^f'^^ticuTar systems, a specific mech- or optical pumping mechanisms ^or particular Y in neral,

anism can normally be ldentlflf ^.^VeoupleA with electron energy the technique of electron ^P^^f^f ^ broadest applicability. This analysis of tbe scattered electrons has ^^ ntZsign with the pro- technique has therefore been ^^n Sources where applicable, and vision of including discharge ^^Z^s. The emphasis of the also the capability of 0Ptlcf1

1 .^ete^'° p it is anticipated that a wide variety

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atoms for example) require a high temperature source. Thus, an electron beam evaporation source, coupled with crossed electron beam excitation for metastable species production, will be employed.

The experiment is enclosed within a double, differentially pumped, stainless steel vacuum chamber, which is bakeable to ZOQOC and capable of producing an ultimate vacuum in the lO^-Torr range. A schematic of Ae vacuum system is shown in Figure 2. The two halves of the vacuum chamber communicate via a small orifice through whxch the atomic beam oasses Thus the atomic beam source and metastable excitation systems are separated from the electron impact, crossed-beam region and from the electron spectrometer. Each chamber is provided with an automatic gate valve for emergency isolation in the event of power failure and also to pro- vide rapid recycling of the system. Liquid nitrogen traps isolate the oil difLion pumps to prevent oil backstreaming from the pumps and contami- nattag sensitive surfaces. Each half of the vacuum chamber is pumped by a 6-inch, high-speed oil diffusion pump.

IIL PRESENT STATUS

Design, fabrication and assembly of the pumping system stainless steel vacuum chamber and gas handling system has been completed The vacuum integrity of the complete system has been checked ^d ^xmied using a helium leak detector. The vacuum system has been fully instru- mented withTutomatic fail/safe control features. The control circuitry for Sis instrumentation is also complete. A photograph of ^e vacuum chamber and pumping system is shown in Figure 3. Figures 4 and 5 are close-ups of the stainless steel vacuum chamber.

Design and fabrication of the electron gun and hemispherical analyzer is complete and final assembly prior to testing is underway. The various controfcircuits for operating the electron spectrometer have been constructed and tested. The cont?ol board is currently being interfaced with the vacuum astern electrical feed throughs. Figure 6 is a photograph of the electron spectrometer showing the electron gun (left) and the hemispherical electro- static analyzer, analyzer entrance optics and channeltron housing (right). The sp^trometer is mounted off the 12-inch-diam. Wheeler Hange shown Slower portion of the picture. Figure 7 is a photograph «^ the electron gun with the outer shield removed. The split plates m the center of the stack are the beam steering plates referred to in the text.

Final cleaning, assembly and electrical connections to the electron spectrometer should be completed in one week. Initially, the operating characteristics of the channeltron multiplier will be measured in order to determine the optimum operating conditions for the pulse-counting circuitry. Testing of the instrument will then commence and the transmission charac- teristics will be determined from measurements of the elastic scattering cross section in He. Thereafter, the auxiliary electron beam will be installed and measurements of the appropriate ground state and metastable state ex- citation cross sections will begin.

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STAINLESS STEEL BAKEABLE

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ELECTRON IMPACT EXPERIMENT

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Figure 2 Schematic of Pumping System and Vacuum Chamber

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f Figure 3 Photograph of Pumping System and Vacuum Chamber

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Figure 4 Photograph of Stainless Steel Vacuum Chamber Showing Side Access Ports to Metastable Source and Electron Spectrometer Chamber

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Figure 5 Photograph of Stainless Steel Vacuum Chamber Showing Wheeler Flange and Vacuum Feedthrough

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Figure 6 Photograph of Electron Gun and Hemispherical Electrostatic Analyzer Mounted on Wheeler Flange

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-13-

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REFERENCES

1

1. Schulz, G.J. , Rev. Mod. Phys. 45, 378(1973).

2 Read, F. H. , J. Phys. E _3. 127(1970).

3. Pavlovic, Z. , Boness, M. J. W. , Herzenberg, A. and Schulz, G. J. , Phys. Rev. A 6, 676(1972).

4. Andrick, D. and Bitsch, A., J. Phys. B 8, 393(1975).

5. Boness, M. J. B. and Schulz, G. , J. Phys. Rev. A 9, 1969(1974).

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6. Kuyatt, C. E. and Simpson, J. A. , Rev. Sei. Inst. 38, 103(1967).

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HQAFSC/XRLW. AndrewaAFB, Washington, D C. 20331. Attn; Maj. J M. Walton, (1 copy)

HQAFSC IDIXAW), Andrew» AFB, Waahington, D C. 20331, Ann; Maj. H Axelrod (1 copy)

Air Force Weapona Lab , Kirtland AF11, NM87M7, Attn: LR(4copieBl AL (2 copiea)

HQ SAMSO (XRTD1, P. Ü Box 92960, Worldway Poatal Center. Lo» Angele». CA 90009. Attn; Lt. Dorian DeMaio (XRTD) (I copy)

AF Avionica Lab (TFO), Wright Patteraon AFB, OH 45433, Attn: Mr. K Hutchinaon (I copy)

Dept of the Air Force, Air Force Material» Lab. (AFSC), Wright Patteraon AFB, OH 45433, Attn; Maj. Paul Elder (LPS) (1 copy) Laaet Window Croup

HQ Aeronautical Syatema Div . Wright Patteraon AFB, OH 45433, Attn: XRF - Mr Clifford Fi-wcett (1 copy)

Rome Air Development Command. C.riffi»» AFB, Rome NY 13440, Attn. Mr R. Urtt (OCSF) (1 copy)

HQ Electronic» .cy»lema Div. (ESL), L. C Hanacom Field, Bedford. MA 01730. Atln: Mr. Alfred E. Anderaon (XRT) (1 copy) Capt. Jamea C. Jalbert (XRJ) (1 copy) Technical Lib-ary (1 copyl

Air Force Rocket Propulaion Lab. , Edward- AFB. CA 93523. Atln; 11. K. Bornhor»:, ( U<CG) (1 copy)

Air Force Aero Propulaion Lab . Wright Patteraon AFB, OH 45433, Attn; Col. Walter Moe (CO (I copy)

Dept. of the Air Force, Foreign Technology Diviaion, Wright Patterson AFB. OH 45433, Attn; PDTN (1 copy)

CINCSAC/INEP, Offutt AFB, NE 68113 (1 copyl

Commandant of the Marine Corp», Scientific Advi»or ICode RD-1), Waahington. D. C. 20380, [I copy)

USAF/1NAKA, Waahington, D. C 20330, Attn: Lt. Col. W M Trueedell, (1 copy)

Aeroepace Reaearch Lab». . (API. Wright Patteraon AFB, OH 454 13, Attn; Lt. Col. Max Duggina (Icopy)

Defenae Intelligence Agency, Waahington, D. C. 20301, Attn: Mr. Seymour Berler (DT1B) (1 copy)

Central Intelligence Agency. Washington. DC. 20505, Attn; Mr. Julian C. Nail, (Icopy)

Analytic Service», Inc., 5613 Leeaburg Pike. Falla Church, VA 22041, Attn: Dr. John Davl» (1 co|

Aeroepace Corp. , P.O. Box 92957. Lo» Angele». CA 90009, Attn: Dr. G P. MUlburn (I copy)

Aire»earch Manuf. Co.. 9851 - 9951 Sepulveda Blvd., Loa Angele», CA 90009, Attn: Mr. A. Coll py)

Atlantic Res. Corp., Shirley Highway at Edaall Road. Alexandria, VA 22314, Attn: Mr. Robert Naian ,1 copy)

AVCO Everett Reaearch Lab. . 2385 Revere Beach Parkway, Everett. MA 02149, Attn: Dr. George Sullon (1 copy) Dr. Jack Daugherty (1 copy)

Battelle Columbu» Laboratoriea, 50c King Avenue, Columbu», OH 43201, Attn; Mr. Fred Tietzel (STOIAC) (1 copy)

Bell Aeroepace Co. , Buffalo, NY 14240,Attn; Dr. Wayne C. Solomon, (Icopy)

Boeing Co. , P.O. Box 3999, Seattle. WA 98124, Attn: Mr. M.I. Gamble 12-1460, MS 8C-88) (2 copie»)

Electro-Optical Syetem», 300 N. Halatead. Pasadena, CA 91107, Attn: Dr. Andrew Jenaen (1 ropy)

ESL Inc., 495 Java Drive, Sunnyvale, CA 94086, Attn: Arthur Einhorn (I copy)

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DISTRIBUTION UST f OH CONTRACT NO: N000 14-7S-C-00H (Conllnu.d)

G.n.r.l tlsctrlc Co . Sp.ci. Diviilon, PO BoxHSSi. Phll.d«lpht., PA 19101, Ann: Dr R.H, SijlfmontMl copy) Dr. C. E Anderton (1 copy!

G.n.r.l El.ttrlt Co. , 100 Pl.itlct Av.nu., pitllfitM, MA 01201. Atln: Mr. D.O. H«rrln|ton (Room 1044) 11 copyl

G.n«r«l Rue.rth Corp. , P.O. Box J587, S«nl. B.rb.r.. CAOJlOi. Attn: Dr R. Holbrookd ropy)

G.ner.l Reee.rch Corp . 1".0I Wilton Blvd , Suit« 700, Arlington, VA 22201, Attn: Dr. Gll«l F. Crlml (1 copy)

H«rculet, Inc., InduitrUl Syettm Dept . Wilmington. DE 1989'), Atlni Dr R. S. Vorltd copy)

Htrculei. Inc . PC Box 210, Cumbtrltnd, MD2I,)02, Atln: Dr RtlphR. Preckel 11 copy I

Huahot Rttetrch Ltbt.. 5011 Mtlibu C;«,.yon Rotd. Mtllbu, CA Otlt-i. Attn: Dr. D. Fortter (I copy) • Dr. A N. Cbttttr (I copy)

Dr. Viktor Evtuhov II copy)

Hughe. Alrcr.ft Co. , Aero.p.c« Croup - Sy.t.mt Dlvitlon. C.nog. P.rk, CA 91304. Attn: Dr. J.ck A. Alc.l.y II copy)

Hughe. Aircr.lt Co. . C .ntln.l. «nd T..1. Street., Bldg. b. MS «-129, Culver City. CA 90230, Attn: Dr. Willl.m Y.t.t II copy)

Inttltute (or Defente An.lyn., 400 Ar.ny N.«y Drive, Arlington, VA 22202, Attn: Dr Alvin Schnit.l.r 11 copy)

John Hopkln. Unlv.r.ity, Applied Phy.lc. L.b , 8621 G. Avenue, Silver Spring. MD 20910. Attn: Dr. Albert M. Ston. (1 copy) v Dr. R.E. Goro.do. (1 copyl

Lawrence 1 ivermore L«b P.O. Box K08, Uvennoie, ^A 94550, Attn: Dr R.E. Kidder 11 copy) Dr. E. Teller 11 copy) Dr. Joe Fleck (1 copy)

U>. Al.mo. Scientldc L.b . P O Box ltb3. Lot Al.mot, NM B7544, Attn: Dr, Keith Boyer (1 copy)

Lul.gl.n .nd A..ocl.tet. Inc. D.l Amo Fln.ncl.l C.nt.r, Suit. 500, 21515 H.wthorn. Blvd , Torr.nc, CA 0950J II copy)

Lockht.d P.lo Alto R«. L.b., 3251 H.nov.r Str«.l, P.lo Alto, CA 94303. Attn: L, R. Luntlord, Orgn. 52-24 Bldg 201 |1 copy)

M>them>Uc.l Sci.nc. Northwe.t. Inc . P O. Box 1887, B.U.vu«, WN 98001, Attn: Mr, Pet.r H. R«M (1 copy) Dr. Abr.h.m H.rt.barg (1 copy)

M.rtln M.ri.tt. Corp , P, O Box 179, M.ll St.tlon 0471, Denver, CO 80201, Attm Mr St.w.rt Ch.pln |1 copy) Mr. Scott Olle. (1 copy)

M....chu.ett. Inttltute ol Technology LINCOLN LAB , P, O. Box 71, Lexington. MA 02173 Attn: Dr. S. Ed.lbtrg 11 copy) Dr, L.C. M.rquet II copy) Or. J. Fieedm.n (1 copy) Dr, G. P. Dlnnt.n 11 copy) Dr, R.H, Redlker (1 copy/

McDonnel Dou.l.t Attron.utlct Co., 5 301 Polt. Av.nu., Huntington Be.ch, CA 92647, Attm Mr. P'!;■ "JUvtlt (1 copy) O.pt. A? , 30-BBFO, M/S» 9 |1 copy)

McDonn.l Dougl.. Ret. L.bt , Dept. 220, Box 516, St. Loult, MO 56166, Attn: Dr. D. P. Am.lllcopy)

MITRE Corp., P.O. Box 208, Bedford, MA 01730, Attm Mr, A.C. Cron II copy)

North Americtn Rockwell Crop. , Auton.tict Dlv . 1370 Mir.lom. Avenue, An.h.lm, CA 92801, Attn: Mr. T T. Kum.gi :' ^PVl C/476 M.u Code HA1B

Northrop Corp . 1-iOi We.t Bro.dw.y, H.wthorne, CA 90250, Attn: Dr Ger.rd H.tt.rjl.n, L..«r Sy.tem. Dept. (I copy)

Dr. Anthony N, Pirri, Phy.lc.l Science. Inc. , IB Ljike.id« OliTce P.rk, W.kefleld. MA 01880 (1 copy)

RAND Corp. 1700 M.ln Street. S.nt. Monlc, CA 90406, Attn: Dr. Cl.ude R. Gulp/Mr. G.A. C.rter (1 copy)

R.ytheonCo. , 28 Seyon Street. W.lth.m. MA 02154, Attn: Dr. Fr.nk A. Horrlg.n |Re., Dlv. )(1 copy)

R.ylheon Co (Equipment Dlvitlon), Botton Pott Ro.d, Sudbury, MA 01776, Attn: Dr. Ch.rle t Sonnentchien 11 copy)

R.ytheonCo., Bedford Lab.. , ML.ile Syttemt Div. , Bedford, MA 01710, Attn: Dr. H.A. Mehlhorn (1 copy)

Rlvertide Rete.rch In.tltute. 80 Wett End Street. Now York, NY 10021, Attn: Dr, L. H, O'Neill (1 copy) Dr, John Bo.e (1 copy) Ml.. Helen Cree.m.n (HPEGL Ubr.ry) (1 copy)

RfcD A..oci.te., Inc. P.O. Box 1580. S.nt. Monlc, CA 90431, Attn: Dr. R.E. LeLevler 11 copy) Dr. R. Hundley (1 copy)

Rockwell lntern.tion.1 Corp. . 1170 Mir.lom. Corp. , An.heim, CA 92801, Attn; R.E Hovd. |DB 29) II copy) Dr. J. Winocur (D/528. HAI4) (1 copy)

Rockwell Intern.lion.l Corp . Ricketdyne Div , Albuquerque Di.trict Office. 3616 Men.ul Blvd, NE, Suite 211, Albuquerque, NMB7110 Attn: C.K. Kr.u., Mgr. (1 copy)

SANDIACorp.. P.O. Box 5800, Albuquerque, NM 87115, Attn: Dr. Al N.r.th (1 copy)

St.nlord Rete.rch In.tltute, Menlo P.rk, CA 94025. Attn: Dr. H. E. Llndberg (I copy) Dr. JE. Mallck (1 copy)

Science Appllc.tion. Inc. , 1911 N. Ft. Meyer Drive, Arlington. VA 22209. Attn: L. Peckh.m (I copy I

Science Application. Inc. , P.O. Box 128. Ann Arbor. MI 48101. Attn: R.E. Meredith (1 copy)

Science Appllc.tion. Inc. . b Pre.ton Court, Bedford, MA 01730, Attn: R. Creenberg (I copy)

Science Application. Inc , P.O. Box 2351. La Jolla, CA 92037, Attn: Dr John A.mu. (1 copy)

Sy.tem., Science »nd Softw.re, P.O. Box)620, La Jolla, CA 92017, Attn: Alan F. Klein (1 copy)

Sy.tem. Con.ult.nt», Inc., 1050 3 l.t Street NW, W..hlngton. D. C 20007. Attn: Dr. R.B. Keller (1 copy)

Thlokol Chemical Corp. . WASATCH Dlv. . P.O. Box 524. Brlgham City, UT 84302, Attn: Mr. J.E. Han.en (I copy)

TRW Syttemt Group. One Space Park. Bldg. R-I RM 1050. Redondo Beach, CA 90278, Attn: Mr. Norman Campbell (1 copy)

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DISIHIHUIION I.I.ST rOB CONTRACT NO: NOOOM 7^-t;-0Üfe4 (Cmttnued)

United Air« r»*t He* Lab*., -100 M«in St reel, Eail Hartford, CTOMOB. Altn: Mr. G H. Mc L»f ferty ( » ( opie») Mr Albert AnKell>eLh II <upy)

Itnited Aircrftft Corp Pr»lt »nd Whitney Acfl. fHv. . Klurtd« Rl. I) ( enter, Watt Palm Beach, Fl. 35402, .Mini Dr. R. A. St hmidtke O copy) Mr Cd Pinaley (2 copies)

VAR1AN Aaiodataa, ElMACOiv., 101 Induatrlal Way, San Carlo*, CA «14070, Attn: Mr. Jack Quinn (I copy)

Vowght Syttem« Div. . LTV Aaroapaca Corp., P.O. Box SS07. DalU*. T» 7^222, Altn: Mr. F. Cl. Simptun, M»il Station 254142 (1 copy I

WeBtinghoute Electric Corp , Defenae «nd Space Center friendalnp Internalinnal Airport - Box 74(>, Baltmiore. Ml) 21201 Attn: Mr- W F. Uat (3 copta«}

WaitiDBhoua* Re*. I-aba. , Beulah Road. Churchill hum. Pfttaborgh, PA iS23S. Altm I)r t. P. Riedel (I copy) Mr R. L. Hundatad U copy)

United Aircraft Company Reaearth Laboratorlea. F:aBt Hartford. Ctü610«, Attn; A J. DeMaria (I copy)

Airborne Inatrunienla Laboratory, Walt Whitorian Road, Melville. NY 1174h, Attn: F. Pa< e (1 copy)

Slsntord Research [natitute. Menlo Park, CA 9402S, Attn: Dr FT. Smith (1 copy)

Gaaaral Electric RfcD Center. Schenectady. NY 1230S, Attn: Dr. t>onald White |l copy)

Cleveland State University. Cleveland, OH 44115. Attn; Dean Jack Soules (I copy)

Easo Research and Engineering Co. . P. O Box«, Linden, NH 07036. Attn: D. Orafsteln (1 copy)

University of Maryland. Department of Physics and Astronomy, College Park. MD 20742, Altn: D. Curry (1 copy)

Sylvsma Electric Products, nc. . I 00 Fergeson Drive, Mountain View. CA ^4040. Attn: L. M Osteri'* 11 copy)

North American Rockwell Corp. . Autonetica Dlviaion, 3370 Mlraloma Avenue. Anaheim, CA 9280?. Attn: R. Cudmundsen (1 copy>

Massathusetts Institute of Technology. 77 Maesachuaetls Avenue. Cambridge, MA 02138, Attn: ('.of. A, Javanflcopy)

Lockheed Missile I. Space Co., Palo AUo Research Laboratories. Palo Alto, CA 94304, Altn: Dr. R.C. Ohlman (I copy)

ILC Laboratories. Inc., 164 Commercial Street. Sunnyvale, CA 94086. Attn: L. Noble (1 copy)

University of Texas at Dallas, P.O. Box 30365. Dallas. TX 75230, Attm Professor Carl B. Collins (1 copy)

Director. Defense Advanced Reasearch Projecta Agency, 1400 Wilson Boulevard. Arlington, Virginia. Attn: Program Management (2 copies)

Director, Naval Reaearch Laboratory, Washin|ton, D. C. 20375. Attn: Code 2629 (6 copUa) Code 2627 (6 copies»

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