Lifetime of the A(v=0) state and Franck-Condon factor of the AX(00) transition of CaF measured by the saturation of laser-induced fluorescence

T. E. Wall, J. F. Kanem, J. J. Hudson, B. E. Sauer, D. Cho, M. G. Boshier, E. A. Hinds, and M. R. Tarbutt
Phys. Rev. A 78, 062509 – Published 22 December 2008

Abstract

We describe a method for determining the radiative decay properties of a molecule by studying the saturation of laser-induced fluorescence and the associated power broadening of spectral lines. The fluorescence saturates because the molecules decay to states that are not resonant with the laser. The amplitudes and widths of two hyperfine components of a spectral line are measured over a range of laser intensities and the results compared to a model of the laser-molecule interaction. Using this method we measure the lifetime of the A(v=0) state of CaF to be τ=19.2±0.7ns, and the Franck-Condon factor for the transition to the X(v=0) state to be Z=0.9870.019+0.013. In addition, our analysis provides a measure of the hyperfine interval in the lowest-lying state of A(v=0), Δe=4.8±1.1MHz.

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  • Received 5 September 2008

DOI:https://doi.org/10.1103/PhysRevA.78.062509

©2008 American Physical Society

Authors & Affiliations

T. E. Wall1, J. F. Kanem1, J. J. Hudson1, B. E. Sauer1, D. Cho2, M. G. Boshier3, E. A. Hinds1, and M. R. Tarbutt1

  • 1Centre for Cold Matter, Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom
  • 2Department of Physics, Korea University, Seoul 136-713, Korea
  • 3Physics Division, Los Alamos National Laboratory, MS D454, Los Alamos, New Mexico 87545, USA

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Vol. 78, Iss. 6 — December 2008

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