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Relaxation of Frenkel-Type Rotational and Vibrational Excitons in Diatomic Molecular Crystals

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Ultrashort Processes in Condensed Matter

Part of the book series: NATO ASI Series ((NSSB,volume 314))

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Abstract

The study of vibrational and rotational relaxation in condensed phases has acquired a new dimension with the development of ultrashort laser pulses and the corresponding techniques for time-resolved optical measurements. Nowadays, infrared-as well as Raman-active transitions can be interrogated with shorter than picosecond (1 ps = 10-12 s) time-resolution using, e.g., infrared absorption saturation [1–4] and transient hole-burning [5] spectroscopy and a variety of time-resolved techniques of stimulated Raman scattering [6–10]. They are complementary to methods in which the linewidths and -shapes of the transitions are measured with high spectral resolution, such as in infrared absorption and persistent [11] hole-burning spectroscopy, and in spontaneous and stimulated Raman scattering [8] [12, Chap. 4]. In most optical investigations only the k ≃ o excitations can be investigated because of the small wavevector of the light and the requirement of wavevector conservation. The goal of these experiments is to acquire a detailed understanding of the relaxation mechanisms of the molecular excitations in solids, relating them to different microscopic effects which are specific for the system under study: anharmonic interactions, impurity scattering, compositional or structural disorder, etc…. Excellent reviews have been published during the past several years, covering the study of the relaxation of internal and external vibrational modes in molecular crystals, and its experimental methods [7, 13–16].

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  1. Department of Physics, University of Antwerp (U.I.A.), Universiteitsplein 1, B - 2610, Wilrijk, Belgium

    Etienne Goovaerts

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  1. University of California, Irvine, Irvine, 92717, California, USA

    Walter E. Bron (Institute Director and Professor of Physics) (Institute Director and Professor of Physics)

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Goovaerts, E. (1993). Relaxation of Frenkel-Type Rotational and Vibrational Excitons in Diatomic Molecular Crystals. In: Bron, W.E. (eds) Ultrashort Processes in Condensed Matter. NATO ASI Series, vol 314. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2954-5_6

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