Absorption of Ultrasound in Organic Crystals,
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In this paper an expression for the transition rate for a molecule in an organic crystal to absorb three phonons of lattice energy into the lowest frequency molecular vibrational mode 0 to 1 transition is presented. The model is a three dimensional simple cubic lattice with nearest neighbor central and noncentral forces between molecules situated at the lattice sites. After making some approximations, the expression is compared with the transition rate determined from ultrasonic experiments on benzene, p-dichlorobenzene, carbon tetrachloride, and cyclohexane. The improvement that the expression offers over the transition rate derived by Liebermann and used by other investigators is discussed.
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