VIBRATIONAL STATE-DEPENDENT HYPERFINE COUPLING OF HF
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Date
1984
Journal Title
Journal ISSN
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Publisher
Ohio State University
Abstract
We study state-dependent spin-rotation coupling by analysis of well-resolved hfs spectra of HF obtained with a frequency-controlled color-center laser spectrometer. A $CH_{4}$-stabilized laser controls a $3.39 \mu m$ auxiliary laser with a frequency-synthesizer phase lock loop. A dual-wavelength transfer interferometer is locked to this auxiliary laser and stabilizes the color-center laser using rf sideband techniques. The system provides digital frequency scanning and observed resonance line widths below 20 kHz. HF ground state hfs coupling constants of Muenter and $Klemperer^{1}$ are used while the excited state hfs constants are adjusted to fit our spectra for R(0), P(2), P(3) and P(4) lines. Excellent fits are obtained but large changes in $C_{F} (-17\%)$ and $C_{H} (-3\%)$ are required. We can semiquantitatively account for these changes in terms of the highly anharmonic vibrational potential and the resulting large changes in $<r_{e}^{-3}>$ with $excitation.^{2}$
Description
$^{\ast}$ Staff Member, Quantum Physics Division, National Bureau of Standards. $^{1}$ J.S. Muenter and W. Klemperer, J. Chem. Phys. 52, 6033 (1970). $^{2}$ D.K. Hindermann and C.D. Cornwell, J. Chem. Phys. 48, 4148 (1968).
Author Institution: Joint Institute for Laboratory Astrophysics, University of Colorado National Bureau of Standards
Author Institution: Joint Institute for Laboratory Astrophysics, University of Colorado National Bureau of Standards