Frequency shift in high order harmonic generation from isotopic molecules
Abstract
We report the first experimental observation of frequency shift in high order harmonic generation (HHG) from isotopic molecules H2 and D2 . It is found that harmonics generated from the isotopic molecules exhibit obvious spectral red shift with respect to those from Ar atom. The red shift is further demonstrated to arise from the laser-driven nuclear motion in isotopic molecules. By utilizing the red shift observed in experiment, we successfully retrieve the nuclear vibrations in H2 and D2, which agree well with the theoretical calculations from the time-dependent Schrodinger equation (TDSE) with Non-Born-Oppenheimer approximation. Moreover, we demonstrate that the frequency shift can be manipulated by changing the laser chirp.
Cite
@article{arxiv.1601.04835,
title = {Frequency shift in high order harmonic generation from isotopic molecules},
author = {Lixin He and Pengfei Lan and Chunyang Zhai and Feng Wang and Wenjing Shi and Qingbin Zhang and Xiaosong Zhu and Peixiang Lu},
journal= {arXiv preprint arXiv:1601.04835},
year = {2016}
}
Comments
5pages, 5figures