STUDIES OF THE FORMATION OF CARBONYL SULFIDE IN ION-IRRADIATED ICES Robert F. Ferrante Morgan M....
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Transcript of STUDIES OF THE FORMATION OF CARBONYL SULFIDE IN ION-IRRADIATED ICES Robert F. Ferrante Morgan M....
![Page 1: STUDIES OF THE FORMATION OF CARBONYL SULFIDE IN ION-IRRADIATED ICES Robert F. Ferrante Morgan M. Spiliotis U.S. Naval Academy Marla H. Moore NASA/Goddard.](https://reader036.fdocuments.net/reader036/viewer/2022062504/5a4d1b197f8b9ab059992dc2/html5/thumbnails/1.jpg)
STUDIES OF THE FORMATION OF CARBONYL SULFIDE IN ION-IRRADIATED ICES
Robert F. FerranteMorgan M. SpiliotisU.S. Naval Academy
Marla H. MooreNASA/Goddard Space Flight Center
Reggie L. HudsonEckerd College
61st International Symposium on Molecular SpectroscopyThe Ohio State University
June 2006
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Ehrenfreund, P. and Fraser, H, “Ice Chemistry in Space”, Solid State Astronomy,NATO ASI Series, V. Pirronello and J. Krelowski, eds., Kluwer Academic Publ. (2002).
ASTRONOMICAL OBSERVATIONS OF OCS
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H+ beam from vdGaccelerator
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2500 2000 1500 1000
0.0
0.2
0.4
0.6
C3O2 C2OHCO
CS2
after irradiation
before irradiation
9.0 K; CO:H2S = 5:1dose = 1.0x1014 H+/cm2
OCS
COCO2
H2S
IRRADIATION OF H2S IN CO
Rela
tive
Abso
rban
ce
Wavenumbers (cm-1)
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2500 2000 1500 1000
-0.1
0.0
0.1
0.2
0.3
SOSO3
9.0 K; CO:SO2 = 5:1dose = 1.0x1014 H+/cm2
OCSSO2
SO2
COCO2
after irradiation
before irradiation
IRRADIATION OF SO2 IN CO
Rela
tive
Abso
rban
ce
Wavenumbers (cm-1)
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2500 2000 1500 1000
-0.1
0.0
0.1
0.2
0.3
0.4
0.5
C3S2
C3S2CS
OCS
9.0 K; CO:CS2 = 5:1dose = 1.0x1014 H+/cm2
after irradiation
before irradiation
CO
CO2
CS2
IRRADIATION OF CS2 IN CO
Rela
tive
Abso
rban
ce
Wavenumbers (cm-1)
![Page 7: STUDIES OF THE FORMATION OF CARBONYL SULFIDE IN ION-IRRADIATED ICES Robert F. Ferrante Morgan M. Spiliotis U.S. Naval Academy Marla H. Moore NASA/Goddard.](https://reader036.fdocuments.net/reader036/viewer/2022062504/5a4d1b197f8b9ab059992dc2/html5/thumbnails/7.jpg)
0.0 1.0x1014 2.0x1014 3.0x1014 4.0x1014
0.00
0.02
0.04
0.06
0.08
0.10
SO2
CS2
H2S
T~10 K
PRODUCTION OF OCS BY PROTON IRRADIATION
No
rmal
ized
OCS
Col
umn
Dens
ity (m
olec
OCS
/ in
itial
ato
m S
)
Radiation Dose (H+/cm2)
CO : H2S CO : CS2 CO : SO2 CO2 : H2S CO2 : CS2 CO2 : SO2
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0 5 10 15 20 25 30
-2.5
-2.0
-1.5
-1.0
-0.5
0.0 CS2
SO2
H2S
OCSpure icesT~10 K
RADIATION DESTRUCTION OF SULFUR COMPOUNDS
Ln (N
orm
. Col
umn
Dens
ity)
Dose (eV/molec)
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2200 2000 1800 1600 1400 1200 1000 800 600
-0.4
-0.3
-0.2
-0.1
0.0
0.1
0.2 COOCS2 SO2
SO2 CS2
CS2T~10K
1.5x1014 H+/cm2
1.0x1014 H+/cm2
5.0x1013 H+/cm2
2.5x1013 H+/cm2
1.0x1013 H+/cm2
before irradiation
IRRADIATION OF PURE OCS
Rela
tive
Abso
rban
ce
Wavenumbers (cm-1)
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0 20 40 60 80 100 120 140 160
0.0
0.2
0.4
0.6
0.8
1.0
1.2
SO2H2SCO CO2
THERMAL BEHAVIOR OF OCS PRODUCT
Norm
aliz
ed A
rea
OCS
205
0 cm
-1 B
and
Temperature (K)
CO:H2S CO2:H2S CO:SO2 CO2:SO2
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RESULTS AND CONCLUSIONS
OCS is readily formed by solid-state processes in low-temperature ices subjected to proton irradiation
- additional thermal activation not required- H2S > SO2 > CS2 as sulfur source
OCS is relatively unstable to destruction by irradiation
- significantly more labile than other S species:
OCS > H2S >> SO2 > CS2
- readily forms SO2 and CS2 on prolonged exposure
OCS formation enhanced by thermal processing in some systems