Open AccessInfluence of laser pulse on the photodetachment of H- ion near a metal surface
Author(s) -
Shanshan Wang,
Dehua Wang,
Tang Tian-Tian,
Huang Kai-Yun
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.053402
Subject(s) - pulse (music) , laser , atomic physics , cross section (physics) , ion , orbit (dynamics) , materials science , phase (matter) , physics , optics , engineering , quantum mechanics , detector , aerospace engineering
Using the closed orbit theory and the formulas of double-pulse laser pulse photodetachment cross section of H- ion near a metal surface, we calculated the laser pulse photodetachment cross section of this system. The results suggest that for the double-pulse laser, if the pulse width is much longer than the particular closed orbit period, the contribution of that closed orbit to the photodetachment cross section is very small. If the pulse width is shorter or can be compared with the particular closed orbit period,the contribution of that closed orbit to the photodetachment cross section is reduced. The cross section depends not only on the pulse width, but also on the time delay and the relative phase of the two pulses. For certain relative phase between the two pulses, the photodetachment cross section is increased; while for other relative phases, the photodetachment cross section is reduced. Therefore, we can use the pulse laser to control the photodetachment process of H- near a metal surface. We hope our results will be helpful for experimental research of photodetachment of negativeion influenced by pulse laser near surfaces.