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Rotational coherence phenomena

Felker, P. M. and Zewail, A. H. (1995) Rotational coherence phenomena. In: Jet Spectroscopy and Molecular Dynamics. Springer Netherlands , New York, NY, pp. 181-221. ISBN 978-94-010-4573-5.

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The development of seeded, supersonic molecular-beam techniques [1] has made it possible to study dynamical phenomena that would be very difficult to study otherwise. The time-domain manifestations of the free rotational motion of large molecular species subsequent to pulsed excitation comprise one such phenomenon [2, 3]. Both the vibrational and rotational cooling that pertain to a seeded-beam sample render the observation of rotational dynamics in the time domain much easier in these samples than in higher temperature gases. The vibrational cooling allows for the spectral isolation of the rotational bands associated with different vibronic (or vibrational) resonances. These bands can be individually excited by ultrafast laser pulses, with the ensuing dynamics due only to rotation. The rotational cooling significantly limits the range of rotational states that can contribute to the dynamics (though many states may still contribute for large species). The effect of this is primarily to slow down the rotational dynamics such that they can be readily observed with picosecond resolution.

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Additional Information:© 1995 Springer Science+Business Media. We are grateful to numerous co-workers, cited in the references herein, who have contributed heavily to the understanding of rotational coherence effects and the development of rotational coherence spectroscopy. We are particularly grateful to S.M. Ohline for the data of Figure 6.18. This work has been supported by grants to PMF and to AHZ from the U.S. National Science Foundation, to PMF from the Petroleum Research Fund, administered by the American Chemical Society, and to AHZ from the U.S. Air Force Office of Scientific Research.
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ID Code:70091
Deposited By: Ruth Sustaita
Deposited On:01 Sep 2016 16:30
Last Modified:11 Nov 2021 04:24

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