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The 51Π state in RbCs examined in a polarisation labelling spectroscopy experiment.

W Jastrzebski1, Yi Zhang2, J Szczepkowski1

  • 1Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|June 1, 2026
PubMed
Summary

This study simplifies the RbCs molecule spectrum using polarization labeling spectroscopy. Researchers accurately determined molecular constants for the 51Π state and constructed its potential energy curve.

Keywords:
Alkali dimersElectronic statesLaser spectroscopyPotential energy curves

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Area of Science:

  • Molecular Physics
  • Spectroscopy
  • Quantum Chemistry

Background:

  • Rubidium caesium (RbCs) molecules are crucial in ultracold atom research.
  • Understanding molecular electronic states is key to controlling chemical reactions.

Purpose of the Study:

  • To investigate the excited electronic state 51Π of the RbCs molecule.
  • To derive accurate molecular constants and construct the potential energy curve for this state.

Main Methods:

  • Polarization labeling spectroscopy was employed to simplify the RbCs absorption spectrum.
  • Rotational resolution was used to observe the 51Π← X1Σ+ band system.
  • The inverted perturbation approach method was utilized for potential energy curve construction.

Main Results:

  • The excited electronic state 51Π was investigated, with its term energy Te determined.
  • Accurate molecular constants were derived for vibrational levels v'≤57 and rotational levels J'=49-103.
  • A potential energy curve for the 51Π state was successfully constructed.

Conclusions:

  • Polarization labeling spectroscopy effectively simplifies complex molecular spectra.
  • The derived molecular constants and potential energy curve provide crucial data for the RbCs 51Π state.
  • This research enhances our understanding of RbCs molecular structure and dynamics.