Rotational Closure In Laser-cooling Nonlinear Molecules

Liu, Jinjun

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https://hdl.handle.net/2142/116934 Copy

Description

Title

Rotational Closure In Laser-cooling Nonlinear Molecules

Author(s)

Liu, Jinjun

Issue Date

2022-06-23

Keyword(s)

Fundamental physics

Abstract

Laser-cooling molecules relies on rapid and continuous photon scattering events that provide the “momentum kicks” that slow down molecules. Experimental implementation of laser cooling with enough photons scattered per molecule (about $10^4$ or $10^5$) requires not only a highly diagonal Franck-Condon matrix but also rotational closure. Achieving rotationally closed photon cycling in laser cooling asymmetric-top molecules is nontrivial\footnote{B. L. Augenbraun, J. M. Doyle, T. Zelevinsky, and I. Kozyryev, Phys. Rev. X 10, 031022 (2020).} due to the lowered symmetry and complex intramolecular interactions, including the spin-orbit interaction and vibronic interactions. In this talk, we will discuss transition intensities between rotational energy levels of electronic states involved in laser-cooling asymmetric-top molecules, rotational branching ratios, and selection rules. Using alkaline-earth monoalkoxide radicals as examples, we will predict the rotational branching ratios using a “coupled-state model” \footnote{ J. Liu, J. Chem. Phys. 148, 124112 (2018).} and discuss possible pumping and re-pumping schemes.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116934

DOI

https://doi.org/10.15278/isms.2022.RM01

Copyright and License Information

Copyright 2022 held by the authors

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