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Laser and Coherence Spectroscopy (Paperback, Softcover reprint of the original 1st ed. 1978)
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Laser and Coherence Spectroscopy (Paperback, Softcover reprint of the original 1st ed. 1978)
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The impact which has been made on spectroscopy by lasers, and by
this route on major segments of physics and chemistry, has received
ample documen tation in the past several years. Two principal
themes emerge from examina tion of the numerous books and
monographs now available on this subject: first, an increase in
spectral resolution to levels previously undreamed of; and, second,
the generation of nonlinear phenomena as a result of the intense
radiation fields available from laser devices. There is one
additional property of laser radiation which, although used
extensively in experiments, does not appear to have been as
thoroughly reviewed as the foregoing aspects. This is the spatial
and temporal coherence of the radiation field produced by the
laser, which makes possible the coherent excitation of molecular
energy states. This feature is the subject of the present volume.
While the use of coherence methods in spectroscopy has been paced
by lasers, it is by no me ans restricted to this technology. In the
second and fourth chapters, microwave sources are discussed as
generators of coherent radiation fields and are used to probe both
rotational energy levels and spin states of electronically excited
molecules. The phenomena discussed in this book, such as nutation,
free induction decay, radiative echoes, rapid pas sage, and so
forth, are really the same in different regions of the spectrum,
and themselves echo from one chapter to the next."
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