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Speed-dependent Voigt dispersion line-shape function: applicable to techniques measuring dispersion signals |
JOSA B, Vol. 29, Issue 10, pp. 2971-2979 (2012)
http://dx.doi.org/10.1364/JOSAB.29.002971
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Abstract
An analytical expression for a Voigt dispersion line-shape function that incorporates speed-dependent effects (SDEs) on the collision broadening, applicable to spectroscopic techniques that measure dispersion signals, is presented. It is based upon a speed-dependent Voigt (SDV) model for absorption spectrometry that assumes that the molecular relaxation rate has a quadratic dependence on molecular speed. The expression is validated theoretically in the limit of small SDEs by demonstration that it reverts to the ordinary Voigt dispersion line-shape function and experimentally in a separate work by experiments performed by the noise-immune cavity-enhanced optical heterodyne molecular spectrometry technique. A comparison is given between the SDEs in the SDV absorption and dispersion line-shape functions. It is shown that both line shapes are affected significantly but differently by SDEs. The expression derived provides, for the first time to our knowledge, a possibility also for the techniques that measure dispersion signals to handle SDEs.
© 2012 Optical Society of America
OCIS Codes
(020.3690) Atomic and molecular physics : Line shapes and shifts
(260.2030) Physical optics : Dispersion
(300.1030) Spectroscopy : Absorption
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(300.6360) Spectroscopy : Spectroscopy, laser
ToC Category:
Spectroscopy
History
Original Manuscript: May 31, 2012
Revised Manuscript: August 9, 2012
Manuscript Accepted: August 24, 2012
Published: September 28, 2012
Citation
Junyang Wang, Patrick Ehlers, Isak Silander, Jonas Westberg, and Ove Axner, "Speed-dependent Voigt dispersion line-shape function: applicable to techniques measuring dispersion signals," J. Opt. Soc. Am. B 29, 2971-2979 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-10-2971
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