학술논문
Radiative lifetime of the A 2{\Pi}1/2 state in RaF with relevance to laser cooling
Document Type
Working Paper
Author
Athanasakis-Kaklamanakis, M.; Wilkins, S. G.; Lassègues, P.; Lalanne, L.; Reilly, J. R.; Ahmad, O.; Au, M.; Bai, S. W.; Berbalk, J.; Bernerd, C.; Borschevsky, A.; Breier, A. A.; Chrysalidis, K.; Cocolios, T. E.; de Groote, R. P.; Fajardo-Zambrano, C. M.; Flanagan, K. T.; Franchoo, S.; Ruiz, R. F. Garcia; Hanstorp, D.; Heinke, R.; Imgram, P.; Koszorús, A.; Kyuberis, A. A.; Lim, J.; Liu, Y. C.; Lynch, K. M.; McGlone, A.; Mei, W. C.; Neyens, G.; Nies, L.; Oleynichenko, A. V.; Raggio, A.; Rothe, S.; Skripnikov, L. V.; Smets, E.; Borne, B. van den; Warbinek, J.; Wessolek, J.; Yang, X. F.; Collaboration, the ISOLDE
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Subject
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Abstract
The radiative lifetime of the $A$ $^2 \Pi_{1/2}$ (v=0) state in radium monofluoride (RaF) is measured to be 35(1) ns. The lifetime of this state is of relevance to the laser cooling of RaF via the optically closed $A$ $^2 \Pi_{1/2} \leftarrow X$ $^2\Sigma_{1/2}$ transition, which is an advantageous aspect of the molecule for its promise as a probe for new physics. The radiative decay rate $\Gamma = 2.9(2)\times 10^7$ s$^{-1}$ is extracted using the lifetime, which determines the natural linewidth of 4.6(3) MHz and the maximum photon scattering rate of $4.1(3)\times 10^6$ s$^{-1}$ of the laser-cooling transition. RaF is thus found to have a comparable photon-scattering rate with other laser-cooled molecules, while thanks to its highly diagonal Franck-Condon matrix it is expected to scatter an order of magnitude more photons when using 3 cooling lasers before it decays to a dark state. The lifetime measurement in RaF is benchmarked by measuring the lifetime of the $8P_{3/2}$ state in Fr to be 83(3) ns, in agreement with literature.
Comment: Submitted; 8 pages of main text, 4 pages of supplemental material
Comment: Submitted; 8 pages of main text, 4 pages of supplemental material