Ion desorption from molecules condensed at low temperature: A study with electron-ion coincidence spectroscopy combined with synchrotron radiation
This article reviews our recent work on photo-stimulated ion desorption (PSID) from molecules condensed at low temperature. We have used electron-ion coincidence (EICO) spectroscopy combined with synchrotron radiation. The history and present status of the EICO apparatus is described, as well as our...
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Veröffentlicht in: | Fizika nizkih temperatur (Kiev) 2003-03, Vol.29 (3), p.321-341 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng ; rus |
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Zusammenfassung: | This article reviews our recent work on photo-stimulated ion desorption (PSID) from molecules condensed at low temperature. We have used electron-ion coincidence (EICO) spectroscopy combined with synchrotron radiation. The history and present status of the EICO apparatus is described, as well as our recent investigations of condensed H2O, NI-13, CH3CN, and CF3CH3. Auger electron photoion coincidence (AEPICO) spectra of condensed H2O at the 0:1s ionization showed that H+ desorption was stimulated by'0:KVV Auger processes leading to two-hole states (normal-Auger stimulated ion desorption (ASID) mechanism). The driving forces for H+ desorption were attributed to the electron missing in the O-H bonding orbitals and the effective hole-hole Coulomb repulsion. The normal ASID mechanism was also demonstrated for condensed NH3. The H+ desorption at the ls resonance of both condensed H2O and condensed NFI3 was found to be greatly enhanced. Based on the AEPICO spectra the following four-step mechanism was proposed: (1) the is transition, (2) extension of the HO-H (H2N-H) distance within |
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ISSN: | 0132-6414 |