Strong-Field Polarizability-Enhanced Dissociative Ionization
Abstract
We investigate dissociative single and double ionization of HeH+ induced by intense femtosecond laser pulses. By employing a semi-classical model with nuclear trajectories moving on field-dressed surfaces and ionization events treated as stochastical jumps, we identify a strong-field mechanism wherein the molecules dynamically align along the laser polarization axis and stretch towards a critical internuclear distance before getting dissociative ionized. As the tunnel-ionization rate is greater for larger internuclear distance and for aligned samples, ionization is enhanced. The strong dynamical rotation is traced back to a maximum in the parallel component of the internuclear-distance-dependent polarizability tensor. Qualitative agreement with our experimental observations is found. Finally the criteria for observing the isotope effect for the ion angular distribution is discussed.
Cite
@article{arxiv.1807.00779,
title = {Strong-Field Polarizability-Enhanced Dissociative Ionization},
author = {Lun Yue and Philipp Wustelt and A. Max Sayler and Gerhard G. Paulus and Stefanie Gräfe},
journal= {arXiv preprint arXiv:1807.00779},
year = {2018}
}
Comments
7 pages