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CONDENSED MATTER

Narrowing of the vibrational spectrum under compression of liquid carbon dioxide

V. G. Arakcheev^ab, V. B. Morozov<sup>ab

a</sup> M. V. Lomonosov Moscow State University, Faculty of Physics
^b International Laser Center of Moscow State University

Abstract: The broadening and shift of the Q bands of the 1388/1285-cm⁻¹ Fermi doublet of carbon dioxide have been measured by means of the spectroscopy of coherent anti-Stokes Raman scattering in a wide density range realized at compression in dense gaseous and liquid states. The spectrum of the low-frequency Q band exhibits an essential narrowing upon the compression of the liquid in the density range of 320–400 amagat from a maximum width of about 2.2 cm⁻¹ to about 1.7 cm⁻¹ determined by elastic dephasing. The observed dependence is connected with the progressive narrowing of the spectral contribution attributed to the collapsed rotational structure.

PACS: 42.65.Dr, 33.20.Fb, 33.-t

Received: 11.08.2009

 English version: Journal of Experimental and Theoretical Physics Letters, 2009, 90:7, 524–529

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