Direct signatures of light-induced conical intersections on the field-dressed spectrum of Na2

TL;DR

This study investigates how light-induced conical intersections (LICIs) influence the spectrum of Na2 molecules under laser light, revealing unique spectral signatures such as new peaks and peak splitting.

Contribution

The paper introduces a theoretical framework to compute field-dressed rovibronic states and identify direct spectral signatures of LICIs in Na2.

Findings

Identification of new absorption and emission peaks due to LICIs

Observation of peak splitting in the field-dressed spectrum

Detection of intensity borrowing effects in the spectrum

Abstract

Rovibronic spectra of the field-dressed homonuclear diatomic Na2 molecule is in- vestigated to identify direct signatures of the light-induced conical intersection (LICI) on the spectrum. The theoretical framework formulated allows the computation of the (1) field-dressed rovibronic states induced by a medium intensity continuous-wave laser light and the (2) transition amplitudes between these field-dressed states with respect to an additional weak probe pulse. The field-dressed spectrum features ab- sorption peaks resembling the field-free spectrum as well as stimulated emission peaks corresponding to transitions not visible in the field-free case. By investigating the dependence of the field-dressed spectra on the dressing-field wavelength, both in full- and reduced dimensional simulations, direct signatures of the LICI can be identified. These signatures include (1) the appearance of new peaks and the splitting of peaks for both absorption and stimulated emission, and (2) the manifestation of an intensity borrowing effect in the field-dressed spectrum.