University of Illinois Urbana-Champaign

Rotational Closure In Laser-cooling Nonlinear Molecules

Liu, Jinjun

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RM01_1.pptx
5908.pdf

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

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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
Genre of Resource
Conference Paper / Presentation
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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Abstracts & Presentations - 2022 International Symposium on Molecular Spectroscopy PRIMARY