PICOSECOND DYNAMICS OF TORSIONAL MOTION IN MALACHITE GREEN ADSORBED ON SILICA - A TIME-RESOLVED SURFACE 2ND HARMONIC-GENERATION STUDY

被引：20

作者：

MORGENTHALER, MJE ^{[1
]}

MEECH, SR ^{[1
]}

机构：

[1] HERIOT WATT UNIV,DEPT CHEM,EDINBURGH EH14 4AS,MIDLOTHIAN,SCOTLAND

来源：

CHEMICAL PHYSICS LETTERS | 1993年 / 202卷 / 1-2期

关键词：

D O I：

10.1016/0009-2614(93)85350-W

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 ground-state recovery dynamics of malachite green adsorbed on silica have been studied by picosecond time-resolved surface second harmonic generation. Reaction dynamics were investigated as a function of coverage, laser intensity and wavelength. A fast component was observed to be independent of all three parameters. This suggests that intramolecular motion may be facile in adsorbates, and that energy disposal is efficient for low-frequency modes. In addition an intensity and coverage dependent disruption of the surface layer was detected. This is tentatively assigned to ultrafast multiphoton chemistry of the aggregates formed at high coverage.

引用

页码：57 / 64

页数：8

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