Transient frequency-modulated spectroscopy: Application to the measurement of vector and scalar correlations in molecular photodissociation

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An intrinsically time-resolved version of frequency-modulation (FM) spectroscopy has been recently developed and applied to the study of gas-phase photodissociation dynamics. Transient FM spectroscopy allows low background detection of radical species with shot-noise limited sensitivities, time resolution sufficient for detection of collisionless photoproducts, and frequency resolution characteristic of single-mode cw lasers. Methods for the quantitative analysis of Doppler-broadened FM line shapes to give velocity and rotational polarization information have been established permitting the measurement of scalar and vector properties of molecular fragmentation in exquisite detail. Several recent examples of the application of transient FM spectroscopy will be presented and discussed, ... continued below

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8 p.

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North, S.W. & Hall, G.E. April 1, 1998.

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  • North, S.W. Texas A&M Univ., College Station, TX (United States). Dept. of Chemistry
  • Hall, G.E. Brookhaven National Lab., Upton, NY (United States)

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Description

An intrinsically time-resolved version of frequency-modulation (FM) spectroscopy has been recently developed and applied to the study of gas-phase photodissociation dynamics. Transient FM spectroscopy allows low background detection of radical species with shot-noise limited sensitivities, time resolution sufficient for detection of collisionless photoproducts, and frequency resolution characteristic of single-mode cw lasers. Methods for the quantitative analysis of Doppler-broadened FM line shapes to give velocity and rotational polarization information have been established permitting the measurement of scalar and vector properties of molecular fragmentation in exquisite detail. Several recent examples of the application of transient FM spectroscopy will be presented and discussed, including correlated scalar distributions in the dissociation of ketene from CH{sub 2}(a{sup 1} A{sub 1}) Doppler profiles, and the full vector correlation analysis of CN (X {sup 2}{Sigma}{sup +}) fragments arising from ICN dissociation.

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8 p.

Notes

OSTI as DE98002800

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  • 1998 SPIE meeting, San Diego, CA (United States), 26-28 Jan 1998

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  • Other: DE98002800
  • Report No.: BNL--65184
  • Report No.: CONF-980135--
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 585052
  • Archival Resource Key: ark:/67531/metadc694400

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  • April 1, 1998

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  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 10, 2015, 12:36 p.m.

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North, S.W. & Hall, G.E. Transient frequency-modulated spectroscopy: Application to the measurement of vector and scalar correlations in molecular photodissociation, article, April 1, 1998; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc694400/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.