High resolution Fourier transform infrared spectroscopy and analysis of the nu(6) band of jet-cooled Mo(CO)(6)

Rovibrational FTIR spectra of Mo(CO)(6) have been recorded in supersonic ar gon expansions at 0.004 cm(-1) resolution. Rotational constants have been d etermined for the nu(6) fundamental band of Mo((CO)-C-12)(6) and for the pa rallel band of the symmetric top isotopomer Mo((CO)-C-13)((CO)-C-12)(5). Fr om these results, a precise estimate of the Coriolis parameter for the nu(6 ) band of the main isotopomer Mo((CO)-C-12)(6) is derived, necessary for th e analysis of the nu(6) spectrum. The observation of an octahedral splittin g clearly resolved for the highest J-lines in the R branch prompted the use of a specific treatment based on the tensorial formalism developed by J.P. Champion, M. Loete, G. Pierre (Spherical top spectra, in: K.N. Rao, A. Web er (Eds.), Spectroscopy of the Earth's Atmosphere and Interstellar Medium, Academic Press Inc., New York, 1992, pp. 339-422). (C) 2000 Elsevier Scienc e B.V. All rights reserved.