Abstract
The collisional exchange between an off-diagonal element of the density matrix and its complex conjugate results in the collapse of a homogeneously broadened spectral line. The case when such exchange is due to the polarization of the heat bath on account of two-photon absorption is studied.
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Pis’ma Zh. Éksp. Teor. Fiz. 64, No. 9, 599–603 (10 November 1996)