Ultrasonic absorption in crystalline benzene
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Authors
Alexander, Howard Wright
Elmore, John E.
Subjects
Advisors
Wilson, O.B.
Date of Issue
1963
Date
Publisher
Monterey, California: U.S. Naval Postgraduate School
Language
en_US
Abstract
The dependence of the absorption of longitudinal
ultrasonic waves in single crystals of benzene on the
frequency and on the orientation of the crystal was
investigated experimentally. Results were compared with
the predictions of the resonance absorption theory.
Individual crystals were obtained by freezing a
melt of highly purified reagent-grade benzene. The
crystals were aligned to desired orientations by optical
techniques. Absorption coefficients were computed from direct
measurements of the attenuation in longitudinal wave
propagation at 5, 10, and 15 megacycles. Results were
obtained at 255 °K for absorption along each of the
principal crystallographic axes and along three offaxial
directions. Absorption was found to be a function of crystal
orientation, both in magnitude and frequency dependence.
The frequency-squared dependence predicted from resonance
absorption theory was observed for some, but not all
orientations. Results indicate the presence of an additional
absorption mechanism. The writers wish to express their appreciation for the
patience shown and the assistance and encouragement rendered
by Professor 0. B. Wilson of the U. S. Naval Postgraduate
School in this work.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.