Abstract
Nonlinear mode-coupling hydrodynamics is used to study the broadening of spectral lines near a liquid-gas critical point. The critical contribution to the line shape is given by a universal line-shape function. For values of which are not too small, the line assumes a Lorentzian form and the width increases as with the critical exponent . Very close to the critical point the line changes into a Levy distribution [the Fourier transform of where ] and the line shape becomes independent of ().
- Received 7 September 1982
DOI:https://doi.org/10.1103/PhysRevLett.50.590
©1983 American Physical Society