Misha Stepanov | publications | J. Phys. B (1997)

D. A. Shapiro, M. G. Stepanov, Diffusion‑broadened lineshape under a strong field, Journal of Physics B 30 (11) L377–L381 (1997).

DOI: 10.1088/0953-4075/30/11/001
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The Bennett hole is analysed for a medium of two‑level particles with weak collisions beyond the scope of the perturbation theory. In the limit of small homogeneous width, the analytical expression for the hole shape is of the form of a Bessel function. The result is compared with data obtained by the variational approximation and numerical calculation. It is shown that the approximation gives the correct width, but an incorrect shape.