Demonstration of MOTRIMS Probing Capability
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Transcript of Demonstration of MOTRIMS Probing Capability
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Demonstration of MOTRIMS Probing Capability
Hai Nguyen, Richard Brédy, Howard Camp, Takaaki Awata, Kyle Wilson,
Brett DePaola.
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OUTLINE
Motivation
Experimental Setup
Review of earlier results
New Results
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MOTIVATION
Collisions with excited target
Cross-section measurements provide rigorous test for TC-AOCC.
Optimizing MOTRIMS capabilities.
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EXPERIMENTAL SETUP
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PREVIOUS RESULTS7 keV Na+ + Rb (5s, 5p)
-5
-4
-3
-2
-1
0
4d 2D5/2
, 4d2D3/2
4f 2F7/2
, 4f2F5/2
5s 2S1/2
4p 2P1/2
, 4p 2P3/2
23Na
4s 2S1/2
3d 2D5/2
, 3d2D3/2
3p 2P1/2
, 3p 2P3/2
3s 2S1/2
12f
4d 2D3/2,5/2
5p 2P3/2
5s 2S1/2
87Rb
Pote
ntia
l Ene
rgy
(eV)
-3 -2 -1 0 1 2 30
2000
4000
6000
8000
10000
12000
14000
16000
4p*
3d*
4d*
5s*
3d
4s*
3p
3p*
3s
Coun
ts
Q value (eV)
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PREVIOUS RESULTS7 keV Na+ + Rb (5s, 5p)
-3 -2 -1 0 1 2 30
1000
2000
3000
4000
5000-3 -2 -1 0 1 2 3
0
5000
10000
15000
5s-3p
5s-3sCo
un
ts
Q value (eV)
Off
y0 786 ±0xc1 0.96112 ±0.00163w1 0.21422 ±0.00328A1 1137.9999 ±15.01743xc2 0.4429 ±0.00137w2 0.21877 ±0.00278A2 1390.17651 ±15.17554
5p-3p5s-3s
5s-3p
5p-3d5p-4p
5p-4s
Co
un
ts
Tot
-3 -2 -1 0 1 2 30
5
10
15
20
Q Value (eV)
TAC
Tim
e (
s)
5.000
6.776
9.183
12.44
16.86
22.85
30.97
41.97
56.88
77.09
104.5
141.6
191.9
260.0
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PREVIOUS RESULTS7 keV Na+ + Rb (5s, 5p)
offonp
onss
offs TnnA )(
ons
onp
onp
ons
s
p
A
A
n
n
ononss
ons TnA
off islaser when Time T
on islaser when Time T
off islaser when s from capture of Amplitude A
on islaser when s from capture of Amplitude A
on islaser when state iin atoms ofnumber n
off
on
offs
ons
th
i
on
off
offs
ons
ons
onp
onp
T
T
A
A
nn
nf 1
ononpp
onp TnA
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PREVIOUS RESULTS7 keV Na+ + Rb (5s, 5p)
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.400
1
2
3
4
5
P /
S
Excited State Fraction
P /
S
Average P /
S
-3 -2 -1 0 1 2 30
2000
4000
6000
8000
10000
12000
14000
16000
4p*
3d*
4d*
5s*
3d
4s*
3p
3p*
3s
Coun
ts
Q value (eV)
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PREVIOUS RESULTSCompared to calculation
1 2 3 4 5 6 7 81
10
100
Collision Energy (keV)
1 2 3 4 5 6 7 81
10
100
Collision Energy (keV)
ss
ps
35
35
sp
pp
45
35
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PREVIOUS RESULTS7 keV Na+ + Rb (5s, 5p)
-3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.00.0000
0.0005
0.0010
0.0015
0.0020 Matrix1
5s-3d
7 keV Na++Rb(5s),Rb(5p) Na*+Rb+
5s-3p
5p-4d
5p-4s
5p-3p
5s-3s
2.000
3.431
5.886
10.10
17.32
29.72
50.99
87.48
150.1
257.5
441.7
757.8
1300
Q value (eV)
Sca
tterin
g A
ngle
(ra
d)
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PREVIOUS RESULTSCompared to calculation
0.0 0.5 1.0 1.5 2.00
2
4
6
8
10
12
14
sin x
DC
S (1
0-1
1cm
2 )
0.0 0.5 1.0 1.5 2.00
2
4
6
85P - 3P
E = 2 keVE = 5 keVE = 7 keV
E (mrad)
Expt
. DC
S (1
0-1
1cm
2 )
0 1 2 3 4 50
2
4
6
8
10
12
sin x
DC
S (1
0-1
3cm
2 )
E (mrad)
0 1 2 3 4 50
2
4
6
8
10
E = 5 keV
E = 2 keV
E = 7 keV
5S - 3P
Expt
. DC
S (1
0-1
3cm
2 )
(keV mrad) (keV mrad)
5p-3p 5s-3p
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Other Collision Systems: Difficulty
-6
-5
-4
-3
-2
-1
012f
4d 2D3/2,5/2
5p 2P3/2
5s 2S1/2
3p 2P1/2
, 3p 2P3/2
3d 2D5/2
, 3d2D3/2
3s 2S1/2
2p 2P1/2
, 2p 2P3/2
2s 2S1/2
7Li87Rb
Poten
tial E
nerg
y (e
V)
-5
-4
-3
-2
-1
012f
4d 2D3/2,5/2
5p 2P3/2
5s 2S1/2
12f
87Rb
4d 2D3/2,5/2
5p 2P3/2
5s 2S1/2
Pote
ntia
l Ene
rgy
(eV)
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CURRENT RESULTS7 keV Li+ + Rb (5s, 5p)
-3 -2 -1 0 1 2 30
5
10
15
20
Q Value (eV)
Tim
e (s
)
1.000
1.886
3.557
6.707
12.65
23.85
44.99
84.84
160.0
-3 -2 -1 0 1 2 30
3000
6000
9000
5s-3s
5p-3p
5s-2p 5p-3s
5p-2p
5s-2s
Coun
ts
Q Value (eV)
total
7 keV Li+ + Rb
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Multi-Projectile Source
0 1000 2000 3000 4000 5000 6000 7000
100
1000
10000
7Li+ + Rb
6Li+ + Rb
23Na+ + Rb
Cou
nts
TOF (channels)
Total TOF Spectrum
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Probe (Na contaminant)
From Previous Results Na+From Na+ Contaminant
MOT excited state fraction
p
son
off
offs
onp
offs
onp
ons
onp
onp
T
T
A
A
n
n
nn
nf
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7 keV Na+ Contaminant
p
son
off
offs
onp
offs
onp
sp
p
T
T
A
A
n
n
nn
nf
04.019.0 f
-3 -2 -1 0 1 2 30
50
100
150
200
250
300
5s-3p
5p-4s
5p-3p
5s-3s
Coun
ts
Q Value (eV)
Total
Na+ Contaminant in Li+ source
p
son
off
offs
onp
offs
onp
ons
onp
onp
T
T
A
A
n
n
nn
nf
From measurements of Li+ Unknown Li+
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Cross Sections 7 keV Li+ + Rb
35.048.3 s
p
023.0828.025
s
ps
091.0125.035
p
pp
Waiting for TC-AOCC results
076.0172.025
s
ss
022.0658.035
p
sp
045.0217.025
p
pp
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7 keV Li+ + Rb Scattering Angle Information
0 200 400 600 800 10000
1000
2000
3000
4000
5000
6000
7000
8000
Coun
ts
Scattering Angle (rad)
5p-3p, 5s-2p, 5p-3s
-3 -2 -1 0 1 2 30
500
1000
1500
2000
5s-2s
5p-2p
5p-3s5s-2p5p-3p
Q Value (eV)
Scatt
erin
g An
gle (
rad)
1.000
2.400
5.759
13.82
33.17
79.59
191.0
458.4
1100
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7 keV Li+ + Rb Scattering Angle Information
0 200 400 600 800 10000
500
1000
1500
2000
2500
Coun
ts
Scattering Angle (rad)
5p-2p, 5s-2s
Grouped scattering angle information are hard to extrapolate (Rb + Rb).
Theoretical Comparison not trustworthy.
Using a weighted method to deduce individual channel scattering angle information.
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Weighted Method (Rb+ + Rb)
Consider an even more extreme case: Rb+ + Rb collision system, where s-s & p-p are completely overlapped.
Because lasers are turned
on/off, we know exactly when capture from 5p not possible.
Weighted by excited state fraction we deduce [Qvs]ss & [Qvs]pp separately.
1.59-1.59 0
TA
C ti
me s
Q Value (eV)5s-5p
5p-5s
5s-5s5p-5p
0
20
5s
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Weighted Method (Rb+ + Rb)
onpp
onss
ontotal NNN
onpp
onss
ontotal NNN
)1( fNT
TN off
ssoff
ononss
1.59-1.59 0
TA
C ti
me s
Q Value (eV)5s-5p
5p-5s
5s-5s5p-5p
0
20
5s
)1(
1fN
T
TN
fN off
ssoff
onontotal
onpp
)1( fNT
TN off
ssoff
ononss
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7 keV Li+ + Rb Scattering Angle Information
-3 -2 -1 0 1 2 30
500
1000
1500
2000
5p-3p 5s-2s5p-2p
5p-3s5s-2p
Q Value (eV)
Scatt
erin
g An
gle(
rad)
1.000
2.306
5.318
12.26
28.28
65.23
150.4
346.9
800.0
-3 -2 -1 0 1 2 30
500
1000
1500
2000
5s-2s
5s-2p
Q Value (eV)
Scatt
erin
g An
gle(
rad)
1.000
2.080
4.325
8.996
18.71
38.91
80.92
168.3
350.0
Laser on Laser off
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7 keV Li+ + Rb Scattering Angle Information
0 200 400 600 800 10000
200
400
600
800
1000
Co
unts
Scattering Angle (rad)
NssON
0 200 400 600 800 10000
500
1000
1500
2000
2500
3000
Coun
ts
Scattering Angle (rad)
NppON
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DEVELOPMENTS
Double (multiple) species pellets development technique.
Diode lasers control and implementation.
Technique of analysis.
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SUMMARY
Multiple species pellets along with extremely high resolution in Q-value allow us to make ‘in situ’ measurements of excited state fraction and relative cross sections.
Kinematically complete collisions study for energetically degenerate channels.
MOTRIMS is a powerful tool for ion-atom collisions.
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SIMPLE OPTICS LAYOUT
TRAP
REPUMP
Sat abs
Sat abs
F=40cmAOM 80MHz Com
TRAPPING OPTICS
Blocker
F=40cm
O I/2
O I
/2
DAVLL
DAVLL
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SIMPLE OPTICS LAYOUT
PBS
PBS
/2
/2
/4
/4
/4
/4
/4
/4
MirrorM
irror
Mirror
Mirror
Mir
ror
Mirror
From AOM
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Projected TOF
0 20 40 60 80 100 120 1404.5x10-5
5.0x10-5
5.5x10-5
6.0x10-5
6.5x10-5
7.0x10-5
7.5x10-5
8.0x10-5
8.5x10-5
9.0x10-5
Cs133
Rb85
K39
Na23
Li6
TO
F s
Mass a.u.
2 KeV 5 KeV 7 KeV
6 8.268E-5 8.548E-5 8.623E-523 7.538E-5 8.086E-5 8.232E-539 7.087E-5 7.801E-5 7.991E-585 6.162E-5 7.216E-5 7.497E-5133 5.442E-5 6.761E-5 7.112E-5
--
Mass a.u. 2 keV s 5 keV s 7 keV s
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STIRAP Application
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STIRAP Application
MOTRIMS will allow us to monitor relative population.
Gain insights into non-destructive STIRAP physics.
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STIRAP Sample Results
-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0
0
1000
2000
3000
7 keV Na+ + Rb(5s),Rb(5p),Rb(4d)
Na(
4d)
Na(
4p)
Na(
3d)
Na(
3p)
Na(
4s)
Na(
4p)
Na(
3d)
Na(
4s)
Na(
3p)
Na(
3s)
Capture on Rb(5s)Capture on Rb(5p)Capture on Rb(4d)
Cou
nts
Q Value (eV)
0 2 4 6 8 100.0
500.0
1000.0
1500.0
2000.0
2500.0
3000.0Laser ONLaser ON Laser OFFLaser OFF
Rb5s Rb5p Rb4d
Coun
t
Time (ms)