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Laser cooling of InF, InCl and InH with an ab initio study.

Rong Yang1, Bin Tang2, XiangYu Han1,3

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Laser cooling feasibility for indium halides and hydride molecules was assessed. Indium monofluoride (InF) shows promise for laser cooling due to favorable spectroscopic properties, unlike InCl and InH.

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Area of Science:

  • Quantum Chemistry
  • Molecular Spectroscopy
  • Laser Cooling

Background:

  • Laser cooling techniques are crucial for high-precision measurements and quantum information processing.
  • Indium-containing molecules are potential candidates for laser cooling, but their suitability requires theoretical investigation.

Purpose of the Study:

  • To investigate the feasibility of laser cooling for indium monofluoride (InF), indium monochloride (InCl), and indium monohydride (InH).
  • To determine the suitability of these molecules for laser cooling applications by calculating key spectroscopic parameters.

Main Methods:

  • Utilized ab initio quantum chemistry methods to calculate electronic structures.
  • Computed spectroscopic parameters, transition dipole moments (TDMs), radiative lifetimes, Franck-Condon factors (FCFs), and excitation wavelengths.
  • Analyzed the C1Π → X1Σ+ and 3Π → X1Σ+ transitions for laser cooling potential.

Main Results:

  • InF exhibits highly diagonal Franck-Condon factors (f00 = 0.961, f11 = 0.909) for the C1Π → X1Σ+ transition with a short radiative lifetime (2.77 ns).
  • The 3Π → X1Σ+ transition in InF also shows favorable diagonal FCFs and short lifetimes.
  • InCl and InH possess off-diagonal FCFs for their 1Π → X1Σ+ transitions, rendering them unsuitable for laser cooling.

Conclusions:

  • Indium monofluoride (InF) is identified as a promising candidate for laser cooling applications.
  • Proposed laser cooling schemes for InF based on the calculated spectroscopic data.
  • The study provides a theoretical foundation for future experimental research on InF, InCl, and InH laser cooling.