激光极化方向对氢负离子在金属面附近光剥离的调控研究

摘要

This paper investigates the impact of the laser polarization direction on the photodetachment of a negative hydrogen ion near a metal surface with the theory of closed orbit.Experimental results show that oscillating amplitude of the photodetachment cross section is maximal when the laser polarization direction is vertical to a metal surface.However,the oscillation amplitude is almost zero when the laser polarization direction is parallel to a metal surface.The oscillation amplitude is between zero and maximum when the laser polarization direction is between parallel and vertical.The experimental results have certain referential value for the photodetachment of negative ions near a surface.%利用闭合轨道理论,研究了激光极化方向对氢负离子在金属面附近光剥离截面的影响。结果表明,当激光极化方向和金属面垂直时,光剥离截面的振荡振幅最大;当激光极化方向和金属面平行时,光剥离截面的振荡几乎消失。当激光极化沿其它方向时,光剥离截面的振幅在两种极限值之间变化。因此,可以通过改变激光的极化方向对负离子体系的光剥离截面进行调控研究。计算结果对于研究负离子体系在表面附近的光剥离问题具有一定的参考价值。