Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-27-C8-30
Selection Rules for Point-Defect Anelastic Relaxations : Classical versus Quantum MechanicalW. Johnson
Materials Reliability Division, National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80303, U.S.A.
A quantum mechanical analysis of selection rules for point-defect relaxations under an applied stress yields different results than a conventional classical analysis. The difference in the two approaches is illustrated using a simple 4-well model. The classical selection rules are a special case of the quantum mechanical selection rules with the wavefunctions of the reorienting defect atoms highly localized in potential minima, such that off-diagonal matrix elements of the stress perturbation are negligible.
© EDP Sciences 1996