X-Ray photoelectron spectroscopy and mass spectrometry studies of X-ray-processed solid CO2
Solid CO2 films have been grown on a stainless steel substrate and processed by X-ray bombardment for up to 6 hr. The reactions induced were monitored using X-ray photoelectron spectroscopy (XPS) and mass spectrometry. The XPS results are twofold: direct X-ray photolysis of the CO2 ice produced CO a...
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ftnortharizonaun:oai:openknowledge.nau.edu:1856 2023-05-15T16:38:17+02:00 X-Ray photoelectron spectroscopy and mass spectrometry studies of X-ray-processed solid CO2 Cornelison, D. M. Dillingham, T. R. Tegler, S. C. Galle, K. Miller, G. A. Lutz, B. L. 1998-09-20 text http://openknowledge.nau.edu/1856/ http://openknowledge.nau.edu/1856/7/Cornelison_DM_etal_1998_X-ray_Photoelectron_Spectroscopy%281%29.pdf https://doi.org/10.1086/306140 en eng http://openknowledge.nau.edu/1856/7/Cornelison_DM_etal_1998_X-ray_Photoelectron_Spectroscopy%281%29.pdf Cornelison, D. M. and Dillingham, T. R. and Tegler, S. C. and Galle, K. and Miller, G. A. and Lutz, B. L. (1998) X-Ray photoelectron spectroscopy and mass spectrometry studies of X-ray-processed solid CO2. The Astrophysical Journal, 505. pp. 443-451. ISSN 1538-4357 QB Astronomy Article PeerReviewed 1998 ftnortharizonaun https://doi.org/10.1086/306140 2020-12-11T11:44:07Z Solid CO2 films have been grown on a stainless steel substrate and processed by X-ray bombardment for up to 6 hr. The reactions induced were monitored using X-ray photoelectron spectroscopy (XPS) and mass spectrometry. The XPS results are twofold: direct X-ray photolysis of the CO2 ice produced CO and an unidentified O product, possibly atomic O; secondary effects resulting from surface reactions between CO, O, and residual H from the vacuum environment produced H2CO, CH3OH, and a water ice cap on the CO2 film. The rate of production of CO from direct X-ray photolysis of CO2 is measured to be 5.4 × 102 molecule photon-1, corresponding to a formation cross section of 4.7 × 10-20 cm2. The growth rate for the water cap is calculated to be 2.6 × 10-4 monolayers s-1 for a partial pressure of H equal to 2 × 10-10 Torr. The appearance of gas-phase products from the film showed a time lag which indicates that the diffusion of the product species in the bulk CO2 is affected by some time-dependent process, possibly the creation of defects in the film. A model for the observed time dependence of the dissociation products in the gas phase yields diffusion coefficients in the CO2 of 5 × 10-12 and 1 × 10-12 cm2 s-1, for O and CO, respectively. Article in Journal/Newspaper Ice cap OpenKnowledge@NAU (Northern Arizona University, Flagstaff) The Astrophysical Journal 505 1 443 451 |
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OpenKnowledge@NAU (Northern Arizona University, Flagstaff) |
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ftnortharizonaun |
language |
English |
topic |
QB Astronomy |
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QB Astronomy Cornelison, D. M. Dillingham, T. R. Tegler, S. C. Galle, K. Miller, G. A. Lutz, B. L. X-Ray photoelectron spectroscopy and mass spectrometry studies of X-ray-processed solid CO2 |
topic_facet |
QB Astronomy |
description |
Solid CO2 films have been grown on a stainless steel substrate and processed by X-ray bombardment for up to 6 hr. The reactions induced were monitored using X-ray photoelectron spectroscopy (XPS) and mass spectrometry. The XPS results are twofold: direct X-ray photolysis of the CO2 ice produced CO and an unidentified O product, possibly atomic O; secondary effects resulting from surface reactions between CO, O, and residual H from the vacuum environment produced H2CO, CH3OH, and a water ice cap on the CO2 film. The rate of production of CO from direct X-ray photolysis of CO2 is measured to be 5.4 × 102 molecule photon-1, corresponding to a formation cross section of 4.7 × 10-20 cm2. The growth rate for the water cap is calculated to be 2.6 × 10-4 monolayers s-1 for a partial pressure of H equal to 2 × 10-10 Torr. The appearance of gas-phase products from the film showed a time lag which indicates that the diffusion of the product species in the bulk CO2 is affected by some time-dependent process, possibly the creation of defects in the film. A model for the observed time dependence of the dissociation products in the gas phase yields diffusion coefficients in the CO2 of 5 × 10-12 and 1 × 10-12 cm2 s-1, for O and CO, respectively. |
format |
Article in Journal/Newspaper |
author |
Cornelison, D. M. Dillingham, T. R. Tegler, S. C. Galle, K. Miller, G. A. Lutz, B. L. |
author_facet |
Cornelison, D. M. Dillingham, T. R. Tegler, S. C. Galle, K. Miller, G. A. Lutz, B. L. |
author_sort |
Cornelison, D. M. |
title |
X-Ray photoelectron spectroscopy and mass spectrometry studies of X-ray-processed solid CO2 |
title_short |
X-Ray photoelectron spectroscopy and mass spectrometry studies of X-ray-processed solid CO2 |
title_full |
X-Ray photoelectron spectroscopy and mass spectrometry studies of X-ray-processed solid CO2 |
title_fullStr |
X-Ray photoelectron spectroscopy and mass spectrometry studies of X-ray-processed solid CO2 |
title_full_unstemmed |
X-Ray photoelectron spectroscopy and mass spectrometry studies of X-ray-processed solid CO2 |
title_sort |
x-ray photoelectron spectroscopy and mass spectrometry studies of x-ray-processed solid co2 |
publishDate |
1998 |
url |
http://openknowledge.nau.edu/1856/ http://openknowledge.nau.edu/1856/7/Cornelison_DM_etal_1998_X-ray_Photoelectron_Spectroscopy%281%29.pdf https://doi.org/10.1086/306140 |
genre |
Ice cap |
genre_facet |
Ice cap |
op_relation |
http://openknowledge.nau.edu/1856/7/Cornelison_DM_etal_1998_X-ray_Photoelectron_Spectroscopy%281%29.pdf Cornelison, D. M. and Dillingham, T. R. and Tegler, S. C. and Galle, K. and Miller, G. A. and Lutz, B. L. (1998) X-Ray photoelectron spectroscopy and mass spectrometry studies of X-ray-processed solid CO2. The Astrophysical Journal, 505. pp. 443-451. ISSN 1538-4357 |
op_doi |
https://doi.org/10.1086/306140 |
container_title |
The Astrophysical Journal |
container_volume |
505 |
container_issue |
1 |
container_start_page |
443 |
op_container_end_page |
451 |
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1766028565466316800 |