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

Simon W. North; Gregory E. Hall

doi:10.1117/12.308399

15 May 1998 Transient frequency-modulated spectroscopy: application to the measurement of vector and scalar correlations in molecular photodissociation

Simon W. North, Gregory E. Hall

Author Affiliations +

Proceedings Volume 3271, Laser Techniques for State-Selected and State-to-State Chemistry IV; (1998) https://doi.org/10.1117/12.308399
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

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 collision-less photoproducts, and frequency resolution characteristics 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 CH₂ Doppler profiles, and the full vector correlation analysis of CN fragments arising from ICN dissociation.

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Simon W. North and Gregory E. Hall "Transient frequency-modulated spectroscopy: application to the measurement of vector and scalar correlations in molecular photodissociation", Proc. SPIE 3271, Laser Techniques for State-Selected and State-to-State Chemistry IV, (15 May 1998); https://doi.org/10.1117/12.308399

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