Substrate-mediated photodesorption from multilayers of CH3I on TiO2(110) at 90 K

被引：12

作者：

Kim, SH ^{[1
]}

Stair, PC ^{[1
]}

Weitz, E ^{[1
]}

机构：

[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

来源：

CHEMICAL PHYSICS LETTERS | 1999年 / 302卷 / 5-6期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0009-2614(99)00156-6

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The substrate-mediated photodesorption of CH3I on TiO2(110) for low fluence irradiation at 257 and 320 nm has been investigated using time-of-flight quadrupole mass spectrometry. The photodesorption of CH3I in contact with TiO2(110) results from resonant electron transfer from photoexcited TiO2(110) to CH3I, followed by an Antoniewicz-type desorption process. Overlayers of 2 similar to 4 monolayer (ML) suppress this resonant desorption process due to collisional interactions. For thick films (> 5 ML), photoexcitation of the TiO2(110) can lead to solvation of an electron ejected from the substrate into the film, which can then induce desorption of molecules from the surface of the film. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：511 / 516

页数：6

共 33 条

[11] PHOTOCHEMISTRY OF ADSORBED MOLECULES .14. PHOTOEJECTION CH(3)X (X=CL, BR) FROM CH3BR/LIF(001) [J].