| Issue |
Europhys. Lett.
Volume 56, Number 6, December 2001
|
|
|---|---|---|
| Page(s) | 808 - 814 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00592-1 | |
| Published online | 01 December 2003 | |
New light scattering technique based on phase time derivative correlation function
Department of Physics of Complex Systems, The Weizmann
Institute of Science 76100 Rehovot, Israel
Received:
5
June
2001
Accepted:
26
September
2001
By using a heterodyne two-cross-beam configuration, we develop a
new light scattering technique to study critical fluctuations.
This optical arrangement gives the possibility to measure the
critical dependence of both the intensity linewidth and the
correlation function of the phase time derivative, in 
near its gas-liquid critical point. We showed both experimentally
and theoretically that the critical behaviour of the phase time
derivative correlation function is determined by the
thermodiffusive mode critical dependence, similar to the intensity
linewidth. A good agreement between the experimental results and
the theory is found.
PACS: 64.60.Fr – Equilibrium properties near critical points, critical exponents / 64.60.Ht – Dynamic critical phenomena / 05.70.Jk – Critical point phenomena
© EDP Sciences, 2001
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