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Fine-structure changing collisions in 87Rb upon D2 excitation in the hyperfine Paschen-Back regime [dataset] Open Access

We investigate fine structure changing collisions in 87Rb vapour upon D2 excitation in a thermal vapour at 350 K; the atoms are placed in a 0.6 T axial magnetic field in order to gain access to the hyperfine Pashen-Back regime. Following optical excitation on the D2 line, the exothermic transfer 5P3/2 →5P1/2 occurs as a consequence of buffer-gas collisions; the 87Rb subsequently emits a photon on the D1 transition. We employ single-photon counting apparatus to monitor the D1 fluorescence, with an etalon filter to provide high spectral resolution. By studying the D1 fluorescence when the D2 excitation laser is scanned, we see that during the collisional transfer process the mJ quantum number of the atom changes, but the nuclear spin projection quantum number, mI , is conserved. A simple kinematic model incorporating a coefficient of restitution in the collision accounted for the change in velocity distribution of atoms undergoing collisions, and the resulting fluorescence lineshape. The experiment is conducted with a nominally “buffer-gas free” vapour cell; our results show that fine structure changing collisions are important with such media, and point out possible implications for quantum-optics experiments in thermal vapours producing entangled photon pairs with the double ladder configuration, and solar physics magneto-optical filters.

Descriptions

Resource type

Dataset

Contributors

Creator: Pizzey, Danielle ¹
Contact person: Pizzey, Danielle ¹
Data collector: Higgins, Clare R. ¹
Editor: Hughes, Ifan G. ¹

¹ Durham University, U.K.

Funder

Engineering and Physical Sciences Research Council

Research methods

Other description

Keyword

Thermal vapours
Hyperfine Paschen-Back regime
State changing collisions
Fluorescence
Photon-counting

Subject

Hyperfine interactions
Fluorescence
Photon detectors

Location

Language

Cited in

Identifier

ark:/32150/r1rr171x31q
doi:10.15128/r1rr171x31q

Rights

Creative Commons Attribution 4.0 International (CC BY)

Publisher

Durham University

Date Created

File Details

Depositor

D. Pizzey

Date Uploaded

30 July 2024, 08:07:24

Date Modified

30 July 2024, 16:07:46

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Characterization

File format: x-7z-compressed (7-zip archive data, version 0.4)

Mime type: application/x-7z-compressed

File size: 142438594

Filename: fine-structure-changing-collisions-data.7z

Original checksum: 7748263826b07d2d42f6d99065ba47e0