= D. A. Kleinman
{c}
{tag=Physicist}
A theoretical <optical physicist> who studied the physical mechanisms of second-order <nonlinear polarization>. His 1962 analysis distinguishes strongly dispersive ionic motion from electronic response far below its resonances. The additional permutation constraints associated with <Kleinman symmetry> reduce the number of independent response coefficients, but require assumptions about the frequency dependence of the mechanism.<Nonlinear Dielectric Polarization in Optical Media by D. A. Kleinman>[Abstract: ionic versus electronic mechanisms and extra symmetry constraints]{ref}
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