Strong-field ionization and AC-Stark shifted Rydberg states in OCS

TL;DR

This paper presents theoretical analysis of intensity-dependent ATI spectra in oriented OCS molecules under intense femtosecond laser pulses, highlighting the role of Rydberg states and multielectron effects, aligning qualitatively with experimental observations.

Contribution

It introduces a theoretical approach incorporating multielectron polarization effects to model ATI spectra and Rydberg state dynamics in OCS molecules under strong laser fields.

Findings

Qualitative agreement with experimental ATI spectra features.

Identification of Rydberg states involved in multiphoton ionization.

Demonstration of multielectron effects influencing ionization dynamics.

Abstract

We present theoretical results for intensity-dependent above-threshold ionization (ATI) spectra from oriented OCS molecules probed by intense femtosecond laser pulses with wavelengths of 800 and 400 nm. The calculations were performed using the time-dependent Schroodinger equation within the single-active-electron approximation and including multielectron polarization effects. The results are in qualitative agreement with experimental data [Yu et al., J. Phys. B: At. Mol. Opt. Phys. 50, 235602 (2017)]. In particular, characteristic features in the ATI spectra which correspond to resonant multiphoton ionization via highly-excited Rydberg states are captured by the theory.