Singlet-triplet Doorway States Of Aluminum Monofluoride

Walter, Nicole

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https://hdl.handle.net/2142/116820 Copy

Description

Title

Singlet-triplet Doorway States Of Aluminum Monofluoride

Author(s)

Walter, Nicole

Contributor(s)

• Meijer, Gerard
• Sartakov, Boris
• Schewe, Christian
• Truppe, Stefan
• Seifert, Johannes

Issue Date

2022-06-20

Keyword(s)

Cold and ultracold molecules

Abstract

Aluminum monofluoride (AlF) possesses highly favorable properties for laser cooling, both via the A$^1\Pi$ and a$^3\Pi$ states. Determining efficient pathways between the singlet and the triplet manifold of electronic states will be advantageous for future experiments at ultralow temperatures. The lowest rotational levels of the A$^1\Pi, v=6$ and b$^3\Sigma^+, v=5$ states of AlF are nearly iso-energetic and interact via spin-orbit coupling. These levels thus have a strongly mixed spin-character and provide a singlet-triplet doorway. We present a hyperfine resolved spectroscopic study of the A$^1\Pi, v=6$ // b$^3\Sigma^+, v=5$ perturbed system in a jet-cooled, pulsed molecular beam. From a fit to the observed energies of the hyperfine levels, the fine and hyperfine structure parameters of the coupled states, their relative energies as well as the spin-orbit interaction parameter are determined. The radiative lifetimes of selected hyperfine levels are experimentally determined using time-delayed ionization, Lamb dip spectroscopy and accurate measurements of the transition lineshapes. The measured lifetimes range between 2 ns and 200 ns, determined by the degree of singlet-triplet mixing for each level.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116820

DOI

https://doi.org/10.15278/isms.2022.MM03

Copyright and License Information

Copyright 2022 held by the authors

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