IR-Spectroscopy of inorganic fluorides dissolved in liquefied noble gases

Abstract

Vibrational spectra of solutions in liquefied noble gases at low temperatures gives wide scope for obtaining information concerning molecules being studied. The main aspect of interest with liquefied noble gases is their high inertness and transparency from the vacuum ultraviolet up to the radio-frequency region. Thus with the obvious advantage of the high accuracy of determining main molecular parameters (frequencies of vibrational bands, force constants, isotopic shifts, etc.), the cryogenic solution method can be used for the study of extremely aggressive and unstable chemical compounds, which includes a considerable number of inorganic fluorides. Moreover, the mentioned method can be used to study intermediate molecular systems formed by complex processes and photochemical reactions and to determine the symmetry, stoichiometry and structure of these molecules. The present work summarises the results of the study of IR spectra of MF 6 ( M=S, U, Mo, W), ClF n ( n=3, 5), C R 3 SiF 3 ( R=H, Cl), XeF m ( m=2, 4, 6), CrO 2F 2, PF 3, etc., solutions in liquid Ar, Kr and Xe. Regular contour formation is observed and a number of spectroscopic parameters are determined. The structural peculiarities of the studied molecules in liquid noble gases are discussed.