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CARS diagnostics of fluid phase behavior in small mesopores at near-critical temperatures

Authors

  • V. G. Arakcheev,

    1. International Laser Center and Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
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  • V. B. Morozov

    Corresponding author
    1. International Laser Center and Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
    • Correspondence to: V. B. Morozov, International Laser Center and Faculty of Physics of M.V. Lomonosov Moscow State University, Moscow 119991, Russia.

      E-mail: morozov@phys.msu.ru

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  • This article is from the ECONOS part of the joint special issue on the European Conference on Nonlinear Optical Spectroscopy (ECONOS 2012) with Guest Editors Johannes Kiefer and Peter Radi and the II Italian Conference of the National Group of Raman Spectroscopy and Non-Linear Effects (GISR 2012) with Guest Editor Maria Grazia Giorgini.

Abstract

Coherent anti-Stokes Raman scattering (CARS) spectroscopy is applied to investigate the fluid phase behavior in small mesopores at bulk sub- and supercritical temperatures. CARS spectra of the Q-branch (1388 cm−1) of carbon dioxide were measured at isothermal compression in pores of two nanoporous glass samples with pore radii of 2 and 3.5 nm. The spectral transformations with pressure of the fluid indicate the formation of a condensed phase in the volume of pores that clearly demonstrates the shift of the critical point. The spectrum of carbon dioxide condensed in the wider pores corresponds approximately to the critical density in bulk. In the narrower pores, the spectrum is noticeably shifted towards the lower wavenumbers that correspond to higher density of condensed fluid. Copyright © 2013 John Wiley & Sons, Ltd.

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