Laser Spectroscopy of the y7PJo states of Cr I

Published

March 16, 2022

Author(s)

Eric Norrgard, Daniel Barker, Stephen Eckel, Sergey Porsev, Charles Cheung, Mikhail Kozlov, Ilya Tupitsyn, Marianna Safronova

Abstract

Here we report measured and calculated values of decay rates of the 3d$^4$($^5$D)4s4p($^3$P$^\rmo}}$)\ y$^7$P$^\rmo}}_2,3,4}$ states of Cr I. The decay rates are measured using time-correlated single photon counting with roughly 1\,\% total uncertainty. In addition, the isotope shifts for these transitions are measured by laser induced fluorescence to roughly 0.5\,\% uncertainty. The decay rate calculations are carried out by a hybrid approach that combines configuration interaction and the linearized coupled cluster method (CI+all-order method). The measurements provide a much needed precision benchmark for testing the accuracy of the CI+all-order approach for such complicated systems with six valence electrons, allowing to significantly expand its applicability. These measurements also demonstrate operation of a cryogenic buffer gas beam source for future experiments with MgF molecules toward quantum blackbody thermometry.

Citation

Physical Review A

Volume

105

Pub Type

Journals

Download Paper

https://doi.org/10.1103/PhysRevA.105.032812

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Keywords

spectroscopy, laser, fluorescence, decay rate, lifetime, configuration interaction, coupled cluster, cryogenic buffer gas beam

Citation

Norrgard, E. , Barker, D. , Eckel, S. , Porsev, S. , Cheung, C. , Kozlov, M. , Tupitsyn, I. and Safronova, M. (2022), Laser Spectroscopy of the y7PJo states of Cr I, Physical Review A, [online], https://doi.org/10.1103/PhysRevA.105.032812, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=933666 (Accessed October 13, 2025)