The dissociation energy of van der Waals complexes determined by velocity map imaging:: values for S0 and S1 p-difluorobenzene-Ar and D0 (p-difluorobenzene-Ar)

被引:29
作者
Bellm, SM [1 ]
Gascooke, JR [1 ]
Lawrance, WD [1 ]
机构
[1] Flinders Univ S Australia, Sch Chem Phys & Earth Sci, Adelaide, SA 5001, Australia
基金
澳大利亚研究理事会;
关键词
D O I
10.1016/S0009-2614(00)01063-0
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 technique of velocity map imaging, an enhanced resolution variant of ion imaging, is shown to be a useful method for determining the dissociation energy of van der Waals complexes. The method is demonstrated by measuring the dissociation energy of p-difluorobenzene-Ar in the S-1 state. From the spectroscopic shift of the S-1 <-- S-0 transition and the change in the ionisation energy between the complex and free p-difluorobenzene, the dissociation energies in the ground state of the neutral and cationic complexes are determined. The values so determined are 339 +/- 4 and 369 +/- 4 cm(-1) for the S-0 and S-1 states of the neutral complex, respectively, and 576 +/- 4 cm(-1) for the cation ground (D-0) state. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:103 / 109
页数:7
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