SIMPLE-MODEL FOR MULTI-PHOTON IONIZATION

被引:22
作者
SWAIN, S
机构
[1] Department of Applied Mathematics and Theoretical Physics, Queen University of Belfast
关键词
D O I
10.1088/0022-3700/12/19/007
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The author examines some simple models for multiphoton ionisation which can be constructed when the bound-free transition rates are much smaller than the bound-bound transition rates and considers how to proceed when this condition is relaxed. The author identifies a regime where the transition rate is time independent. If the laser has a sufficiently broad linewidth one can use a rate equation approach; this assertion is justified and applied to two-, three- and N-photon ionisation. If the laser is narrow-band, a density matrix method has to be used and the effects of different laser lineshapes are discussed. In three-photon ionisation the role of optical pumping effects is emphasised. Explicit expressions for the multiphoton ionisation probabilities are presented and finally some extensions of the method are briefly discussed.
引用
收藏
页码:3201 / 3228
页数:28
相关论文
共 50 条