Diffusion-broadened line shape near a turning point

D. A. Shapiro, M. G. Stepanov

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The absorption spectrum of a gas with a large Doppler width and soft collisions between particles is studied. The particles are assumed to have a nonlinear dependence of the resonance frequency on velocity. The shape of the narrow peak in the spectrum resulting from an extremum of this dependence is calculated analytically for the first time. In the absence of collisions it has a characteristic asymmetric shape. Collisions are shown to broaden the line and change its shape. The profile of the probe-field spectrum is obtained for a three-level system with the strong field at an adjacent transition. The components of the Autler-Townes doublet are found to spread and repel each other because of collisions.

Original languageEnglish (US)
Pages (from-to)29-35
Number of pages7
JournalJETP Letters
Issue number1
StatePublished - 1998

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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