# Rovibronic spectra of molecules dressed by light fields

## TL;DR

This paper develops a quantum mechanical framework for understanding rovibronic spectra of molecules influenced by classical light fields, with detailed analysis on Na₂ and implications for spectroscopic measurements.

## Contribution

It introduces a comprehensive quantum theory for light-dressed rovibronic spectra and simplifies the analysis for Na₂, elucidating physical processes and spectral dependencies.

## Key findings

- Physical origin of spectral peaks explained
- Spectral features depend on field intensity and wavelength
- Implications for extracting field-free spectra discussed

## Abstract

The theory of rovibronic spectroscopy of light-dressed molecules is presented within the framework of quantum mechanically treated molecules interacting with classical light fields. Numerical applications are demonstrated for the homonuclear diatomic molecule Na$_2$, for which the general formulae can be simplified considerably and the physical processes leading to the light-dressed spectra can be understood straightforwardly. The physical origin of different peaks in the light-dressed spectrum of Na$_2$ is given and the light-dressed spectrum is investigated in terms of its dependence on the dressing field's intensity and wavelength, the turn-on time of the dressing field, and the temperature. The important implications of light-dressed spectroscopy on deriving field-free spectroscopic quantities are also discussed.