Regular Article

Semiclassical theory of double-pulse spectra for time dependent systems

¹ Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, P.R. China
² School of Physical Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P.R. China

^a e-mail: shahab_phy@itp.ac.cn

Received: 28 May 2019
Revised: 20 July 2019
Published online: 3 September 2019

Abstract

A theory of double-pulse photodetachment spectra in the presence of time dependent field has been developed. We derived a general formula for the total population generated by the double-pulse laser applying the time dependent closed orbit theory. We analyzed the double-pulse spectra for H⁻ in the presence of constant electric field superposed with a sinusoidal time dependent field. The effects of the amplitude of time dependent field and laser parameters have been investigated. It has been shown that the population has peak or valley when the time delay between the two pulses of the double-pulse laser is equal to the time of the closed orbit emanating at the peak of the first pulse of the double-pulse laser. We also shown that the laser phase parameter modulates the population.