✦ LIBER ✦

Determination of the modulation regime for vibrational dephasing. Demonstration on the critical Raman broadening in nitrogen

✍ Scribed by J. Chesnoy

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 537 KB
Volume: 125
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(86)87062-2

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✦ Synopsis

We show that aJoint analysts of spontaneous Raman spectra and time-resolved CARS experiments permits an unambiguous determinatton of the modulation speed leading to vibrational dephasing. For the case of nitrogen, we find in particular that the dephasing rate itself is enhanced when the critical point is approached.

The modulation regime becomes mtermedtate between the fast and slow hmits (homogeneous and inhomogeneous limits). The modulatton speed, having a correlation time around 10 ps, is determined by the density fluctuations on the scale of the potential range.