Hydration and H/D exchange of CH3OH adsorbed on the D2O–ice surface studied by time-of-flight secondary-ion mass spectrometry (TOF-SIMS)

Autor:	H. Kawanowa, M. Kondo, R. Souda, Yoshihiko Gotoh
Rok vydání:	2004
Předmět:	Chemistry Hydrogen bond Analytical chemistry Surfaces and Interfaces Atmospheric temperature range Condensed Matter Physics Surfaces Coatings and Films Ion Secondary ion mass spectrometry Adsorption Materials Chemistry Molecule Surface layer Layer (electronics)
Zdroj:	Surface Science. :1190-1195
ISSN:	0039-6028
DOI:	10.1016/j.susc.2004.06.086
Popis:	It is demonstrated that the reorganization of the water-methanol hydrogen bond can be investigated on the basis of the TOF-SIMS experiments with increasing temperature. From the CH 3 OH molecules adsorbed on the D 2 O-ice surface, the D + (CH 3 OH) ions are sputtered predominantly in the temperature range between 120 and 140 K since most of the CH 3 OH molecules form the hydrogen bonds with the D 2 O layer. A rapid and almost complete H/D exchange. yielding the D + (CH 3 OD) species, occurs above 140 K due to the enhanced mobility of the D 2 O molecules. This is supported by the fact that the CH 3 OH molecules buried in the thick D 2 O layer segregate to the topmost surface layer above 140 K. The methanol exists on the surface of the heavy-water layer up to the evaporation temperature (180 K), whereas the heavy-water tends to be incorporated in the thin-layer bulk of the methanol ice at 100 K.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::280329e40affc0f2116e01b84a745e36 https://doi.org/10.1016/j.susc.2004.06.086 Zobrazit plný text záznamu Full Text from ScienceDirect