Femtosecond near-infrared laser desorption of multilayer benzene on Pt{111}: A molecular Newton's cradle?

被引：29

作者：

Arnolds, H ^{[1
]}

Rehbein, C ^{[1
]}

Roberts, G ^{[1
]}

Levis, RJ ^{[1
]}

King, DA ^{[1
]}

机构：

[1] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 14期

关键词：

D O I：

10.1021/jp993688e

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：

Velocity distributions resulting from the intense, near-IR laser desorption of multilayers of benzene adsorbed on Pt(lll) are reported as a function of laser intensity, which was varied by changing fluence and pulse width. The velocity distributions as a function of intensity show characteristics of both thermally and electronically induced desorption. Changing the pulse width from the subpicosecond to the subnanosecond regime only results in a small quantitative change in the velocity distributions, suggesting a similar desorption mechanism for laser pulse duration spanning 3 orders of magnitude. Possible mechanisms are discussed and a new mechanism is proposed in which the process is initiated by a thermally assisted DIET excitation in the chemisorbed layer, and followed by energy transfer from the Pt-benzene interface to the outermost benzene layers via a molecular Newton's cradle mechanism.

引用

页码：3375 / 3382

页数：8

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[1] STRUCTURE AND ELECTRONIC FACTORS IN BENZENE COORDINATION TO CR(CO)3 AND TO CLUSTER-MODELS OF NI, PT, AND AG(111) SURFACES [J].