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Vibrational spectra of carbon dioxide adsorbed on nanopore walls at supermonolayer and submonolayer coverage

Authors

  • V. G. Arakcheev,

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

      E-mail: arakcheev@physics.msu.ru

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  • V. B. Morozov

    1. International Laser Center and Physics Faculty of M.V. Lomonosov Moscow State University, Moscow, Russia
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  • This article is part of the special issue of the Journal of Raman Spectroscopy entitled “European Conference on Nonlinear Optical Spectroscopy (ECONOS 2013)” edited by Julian Moger and Peter Radi.

Abstract

Coherent anti-Stokes Raman scattering (CARS) spectroscopy is applied to probe the microstructure of CO2 adsorbed in nanoporous glass Vycor with a mean pore radius of 2 nm. CARS spectra of the Q-branch (1388 cm-1) were measured at 22 °C at pressures decreasing in a range providing the transition from the condensed phase in the whole volume of the pores to submonolayer coverage on their walls. The spectral behavior demonstrates sequential changes in the fluid state inside the nanopores. The analysis of the experimental results allowed us to characterize and compare the spectral properties of gas-like, liquid-like, and surface adsorbed carbon dioxide. The results provide clear evidence that as the surface coverage is decreased, the vibrational frequency shifts down. Copyright © 2014 John Wiley & Sons, Ltd.

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