MULTIPHOTON IONIZATION VS MULTIPHOTON DISSOCIATION - COMPETITION BETWEEN PHOTOIONIZATION AND DISSOCIATION IN CO

被引:20
作者
HILL, WT
TURNER, BP
LEFEBVREBRION, H
YANG, S
ZHU, J
机构
[1] Institute for Physical Science and Technology, University of Maryland, College Park
[2] Laboratoire de Photophysique Moléculaire du C.N.R.S, Bâtiment 213, Université de Paris-Sud
关键词
D O I
10.1063/1.457786
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 competition between photoionization and spontaneous dissociation involving the 3Π states of CO has been investigated both experimentally and theoretically. In this study we analyzed the mass and kinetic energy spectra of the photofragments generated after irradiating CO with a line narrowed (≈0.75 cm-1) tunable ArF* laser (λ≈193 nm) and calculated the cross section (3.2 Mb) for photoionizing the c3Π Rydberg state of CO at the excitation energy. The basic conclusions of this study are that the interaction between the 3Π Rydberg states and the 3Π valence states near 12.8 eV causes rapid (picosecond time scale or faster) dissociation of CO which impedes photoionization and that multiphoton dissociation completely dominates multiphoton ionization at laser power densities up to at least 30 GW/cm 2. © 1990 American Institute of Physics.
引用
收藏
页码:4272 / 4276
页数:5
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