APS

Lu Fano plot for interpretation of photoassociation spectra

Viatcheslav Kokoouline, Cyril Drag, P. Pillet, Françoise Masnou-Seeuws

Published May 1, 2002• 0 citations

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APS

Lu Fano plot for interpretation of photoassociation spectra

Viatcheslav Kokoouline, Cyril Drag, P. Pillet, Françoise Masnou-Seeuws

Published May 1, 2002• 0 citations

OpenAlex

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Lu-Fano plot for interpretation of the photoassociation spectra

Viatcheslav Kokoouline, Cyril Drag, P. Pillet +1 more

Recently, the method of Lu-Fano plots was extended to potentials with general ${R}^{\ensuremath{-}n}$ asymptotic behavior. The aim of this paper is to discuss the efficiency of this method for the interpretation of experimental vibrational spectra of long-range diatomic molecules when two channels are coupled. A Lu-Fano analysis is implemented on experimental data for the ${\mathrm{Cs}}_{2}{0}_{u}^{+}{(6S+6P}_{1/2,3/2})$ photoassociation spectra below the ${6S+P}_{1/2}$ and ${6S+P}_{3/2}$ dissociation limits. The parameters are fitted on level energies and predissociation widths, giving information about the asymptotic coefficients ${C}_{3}$ for both channels and about a coupling parameter which determines the variation of predissociation widths as a function of detuning. This parameter can be extrapolated above the ${6S+P}_{3/2}$ threshold to yield the fine-structure transition cross section between the two channels. The probability for such a transition in a model where hyperfine structure effects are neglected is found to be 0.54.Recently, the method of Lu-Fano plots was extended to potentials with general ${R}^{\ensuremath{-}n}$ asymptotic behavior. The aim of this paper is to discuss the efficiency of this method for the interpretation of experimental vibrational spectra of long-range diatomic molecules when two channels are coupled. A Lu-Fano analysis is implemented on experimental data for the ${\mathrm{Cs}}_{2}{0}_{u}^{+}{(6S+6P}_{1/2,3/2})$ photoassociation spectra below the ${6S+P}_{1/2}$ and ${6S+P}_{3/2}$ dissociation limits. The parameters are fitted on level energies and predissociation widths, giving information about the asymptotic coefficients ${C}_{3}$ for both channels and about a coupling parameter which determines the variation of predissociation widths as a function of detuning. This parameter can be extrapolated above the ${6S+P}_{3/2}$ threshold to yield the fine-structure transition cross section between the two channels. The probability for such a transition in a model where hyperfine structure effects are neglected is found to be 0.54.

Physical Review AJun 7, 200214 citations

Photoassociation spectroscopy of long range molecular states

\ ^{87}

Rb. Lu-Fano analysis and improved Le Roy-Bernstein

{\mathrm{Cs}}_{2}{0}_{u}^{+}{(6S+6P}_{1/2,3/2})

photoassociation spectra below the

{6S+P}_{1/2}

and

{6S+P}_{3/2}

dissociation limits. The parameters are fitted on level energies and predissociation widths, giving information about the asymptotic coefficients

{C}_{3}

for both channels and about a coupling parameter which determines the variation of predissociation widths as a function of detuning. This parameter can be extrapolated above the

{6S+P}_{3/2}

threshold to yield the fine-structure transition cross section between the two channels. The probability for such a transition in a model where hyperfine structure effects are neglected is found to be 0.54.