Reactions induced by low energy electrons in cryogenic films
We review recent research on reactions (including dissociation) initiated by low-energy electron bombardment of monolayer and multilayer molecular solids at cryogenic temperatures. With incident electrons of energies below 20 eV, dissociation is observed by the electron stimulated desorption (ESD) o...
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| Опубліковано в: : | Физика низких температур |
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| Дата: | 2003 |
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| Формат: | Стаття |
| Мова: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2003
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| Цитувати: | Reactions induced by low energy electrons in cryogenic films / Andrew D. Bass Leon Sanche // Физика низких температур. — 2003. — Т. 29, № 3. — С. 270-285. — Бібліогр.: 88 назв. — англ. |
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Bass, Andrew D. Sanche, Leon 2018-01-14T09:04:22Z 2018-01-14T09:04:22Z 2003 Reactions induced by low energy electrons in cryogenic films / Andrew D. Bass Leon Sanche // Физика низких температур. — 2003. — Т. 29, № 3. — С. 270-285. — Бібліогр.: 88 назв. — англ. 0132-6414 PACS: 79.20.La, 82.30.Lp https://nasplib.isofts.kiev.ua/handle/123456789/128816 We review recent research on reactions (including dissociation) initiated by low-energy electron bombardment of monolayer and multilayer molecular solids at cryogenic temperatures. With incident electrons of energies below 20 eV, dissociation is observed by the electron stimulated desorption (ESD) of anions from target films and is attributed to the processes of dissociative electron attachment (DEA) and to dipolar dissociation. It is shown that DEA to condensed molecules is sensitive to environmental factors such as the identity of co-adsorbed species and film morphology. The effects of image-charge induced polarization on cross-sections for DEA to CH₃Cl are also discussed. Taking as examples, the electron-induced production of CO within multilayer films of methanol and acetone, it is shown that the detection of electronic excited states by high resolution electron energy loss spectroscopy can be used to monitor electron beam damage. In particular, the incident energy dependence of the CO indicates that below 19 eV, dissociation proceeds via the decay of transient negative ions (TNI) into electronically excited dissociative states. The electron induced dissociation of biomolecular targets is also considered, taking as examples the ribose analog tetrahydrofuran and DNA bases adenine and thymine, cytosine and guanine. The ESD of anions from such films also show dissociation via the formation of TNI. In multilayer molecular solids, fragment species resulting from dissociation, may react with neighboring molecules, as is demonstrated in anion ESD measurements from films containing O₂ and various hydrocarbon molecules. X-ray photoelecton spectroscopy measurements reported for electron irradiated monolayers of H₂O and CF₄ on a Si - H passivated surface further show that DEA is an important initial step in the electron-induced chemisorption of fragment species. We gratefully acknowledge the cooperation and contributions of many colleagues in Sherbrooke and elsewhere, without whom this work was not have been possible. This research was supported by the Canadian Institutes of Health Research and by the National Cancer Institute of Canada. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Electronically Induced Phenomena: Low Temperature Aspects Reactions induced by low energy electrons in cryogenic films Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Reactions induced by low energy electrons in cryogenic films |
| spellingShingle |
Reactions induced by low energy electrons in cryogenic films Bass, Andrew D. Sanche, Leon Electronically Induced Phenomena: Low Temperature Aspects |
| title_short |
Reactions induced by low energy electrons in cryogenic films |
| title_full |
Reactions induced by low energy electrons in cryogenic films |
| title_fullStr |
Reactions induced by low energy electrons in cryogenic films |
| title_full_unstemmed |
Reactions induced by low energy electrons in cryogenic films |
| title_sort |
reactions induced by low energy electrons in cryogenic films |
| author |
Bass, Andrew D. Sanche, Leon |
| author_facet |
Bass, Andrew D. Sanche, Leon |
| topic |
Electronically Induced Phenomena: Low Temperature Aspects |
| topic_facet |
Electronically Induced Phenomena: Low Temperature Aspects |
| publishDate |
2003 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
We review recent research on reactions (including dissociation) initiated by low-energy electron bombardment of monolayer and multilayer molecular solids at cryogenic temperatures. With incident electrons of energies below 20 eV, dissociation is observed by the electron stimulated desorption (ESD) of anions from target films and is attributed to the processes of dissociative electron attachment (DEA) and to dipolar dissociation. It is shown that DEA to condensed molecules is sensitive to environmental factors such as the identity of co-adsorbed species and film morphology. The effects of image-charge induced polarization on cross-sections for DEA to CH₃Cl are also discussed. Taking as examples, the electron-induced production of CO within multilayer films of methanol and acetone, it is shown that the detection of electronic excited states by high resolution electron energy loss spectroscopy can be used to monitor electron beam damage. In particular, the incident energy dependence of the CO indicates that below 19 eV, dissociation proceeds via the decay of transient negative ions (TNI) into electronically excited dissociative states. The electron induced dissociation of biomolecular targets is also considered, taking as examples the ribose analog tetrahydrofuran and DNA bases adenine and thymine, cytosine and guanine. The ESD of anions from such films also show dissociation via the formation of TNI. In multilayer molecular solids, fragment species resulting from dissociation, may react with neighboring molecules, as is demonstrated in anion ESD measurements from films containing O₂ and various hydrocarbon molecules. X-ray photoelecton spectroscopy measurements reported for electron irradiated monolayers of H₂O and CF₄ on a Si - H passivated surface further show that DEA is an important initial step in the electron-induced chemisorption of fragment species.
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| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/128816 |
| citation_txt |
Reactions induced by low energy electrons in cryogenic films / Andrew D. Bass Leon Sanche // Физика низких температур. — 2003. — Т. 29, № 3. — С. 270-285. — Бібліогр.: 88 назв. — англ. |
| work_keys_str_mv |
AT bassandrewd reactionsinducedbylowenergyelectronsincryogenicfilms AT sancheleon reactionsinducedbylowenergyelectronsincryogenicfilms |
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2025-12-07T19:36:25Z |
| last_indexed |
2025-12-07T19:36:25Z |
| _version_ |
1850879440755621888 |