CO_(2)分子在飞秒强激光场中的光电离实验研究

Experimental Study on Photoionization of CO_(2) Molecules in Femtosecond Intense Laser Field

利用真空腔体系统、超声脉冲分子束系统和直线式飞行时间质谱仪等实验装置,研究了线性三原子分子CO_(2)在波长800 nm,重复频率1 000 Hz、脉宽35 fs的飞秒强激光场中光电离行为.测量了CO_(2)分子随激光光场强度和激光偏振状态变化的飞行时间质谱.基于飞秒强激光场理论,从激光的偏振度效应、极化效应和光强依赖关系等方面,对CO_(2)分子在飞秒强激光场中光电离进行了分析.

In this paper, the photoionization behavior of linear triatomic molecule CO_(2)in femtosecond intense laser field with wavelength of 800 nm, repetition rate of 1 000 Hz and pulse width of 35 fs have been studied by using experimental devices such as vacuum cavity system, ultrasonic pulsed molecular beam system and linear time-of-flight mass spectrometer.The time-of-flight mass spectrometry of CO_(2)molecules varying with laser light field intensity and laser polarization state was measured.Based on the theory of femtosecond intense laser field, the photoionization of CO_(2)molecule in femtosecond intense laser field is analyzed from the aspects about the laser polarization effect, laser ellipticity and the dependence of the laser intensity.