Double Resonance Spectroscopy Of Multiple-Photon Excited Molecules

J. I . Steinfeld; J. E. Melzer

doi:10.1117/12.955607

5 December 1977 Double Resonance Spectroscopy Of Multiple-Photon Excited Molecules

J. I . Steinfeld, J. E. Melzer

Proceedings Volume 0113, Advances in Laser Spectroscopy I; (1977) https://doi.org/10.1117/12.955607
Event: 21st Annual Technical Symposium, 1977, San Diego, United States

Abstract

Multiple infrared photon absorption is a quite general process which molecules can undergo when placed in a high flux of infrared energy, such as the focussed beam of a CO₂ laser. Among the important consequences of this kind of absorption are isotopically selective molecular dissociation and stimulation of specific chemical reactions. In order to understand how this process works, we must be able to follow the evolution of the molecules through their internal states, populated by photon absorption. Double resonance spectroscopy is the method of a choice for getting at this information. A system pumped by CO₂ laser radiation can be examined with a tunable laser probe beam, such as that from a lead-salt diode laser. From such an experiment, we can directly observe Rabi modulation of the absorption lines, determine elementary state-to-state relaxation pathsways, and locate higher excited vibrational states. Systems currently under investigation include SF₆ and vinyl chloride. In suitable cases, the probe beam can be a tunable visible or u.v. source, such as a dye laser. Fluorescence spectroscopy can then be used to monitor the transient absorptions produced by multiple-photon excitation. Among the systems which can be examined in this way are biacetyl and glyoxal.

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J. I . Steinfeld and J. E. Melzer "Double Resonance Spectroscopy Of Multiple-Photon Excited Molecules", Proc. SPIE 0113, Advances in Laser Spectroscopy I, (5 December 1977); https://doi.org/10.1117/12.955607

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KEYWORDS

Absorption

Infrared radiation

Molecules

Spectroscopy

Molecular spectroscopy

Molecular lasers

Infrared spectroscopy

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