V. G. Arakcheev, V. N. Bagratashvili, A. A. Valeev, V. M. Gordienko, V. V. Kireev, V. B. Morozov, A. N. Olenin, V. K. Popov, V. G. Tunkin, D. V. Yakovlev, “CARS spectroscopy of carbon dioxide in the critical point vicinity”, Kvantovaya Elektronika, 2004, Volume 34, Number 1,Pages <nobr>86

This article is cited in 4 papers

Laser applications and other topics in quantum electronics

CARS spectroscopy of carbon dioxide in the critical point vicinity

V. G. Arakcheev^a, V. N. Bagratashvili^b, A. A. Valeev^a, V. M. Gordienko^a, V. V. Kireev^a, V. B. Morozov^a, A. N. Olenin^a, V. K. Popov^b, V. G. Tunkin^a, D. V. Yakovlev^a

^a Lomonosov Moscow State University, Faculty of Physics
^b Department of Advanced Laser Technologies ILIT, Troitsk, Moscow Region

Abstract: The transformation of the Q-band of the low-frequency 1285-cm^-1 component of the 2v₂/v₁ Fermi doublet of a CO₂ molecule is studied in the critical point vicinity (T_c = 31.03 °C, P_c = 72.8 atm) by the CARS method. CARS spectra were recorded by changing pressure isothermically from 48 to 120 atm at several temperatures in the range between 25 and 36°C. At the temperature above 29°C, the pressure dependences of the Q-band width pass through the maximum, which exceeds by 40% –50% the typical Q-band width in the liquid phase. The position of the maximum shifts to higher pressures with increasing temperature. The inhomogeneous broadening of the Q-band is interpreted based on the cluster microstructure of a supercritical fluid.

PACS: 42.65.Dr, 42.62.Fi

Received: 06.05.2003