6533b7cefe1ef96bd1257b8b

RESEARCH PRODUCT

Diode laser spectroscopy of the nu(8) band of the SF(5)Cl molecule.

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Abstract Diode laser spectra of SF 5 Cl have been recorded in the ν 8 band region at a temperature of ca. 240 K, a pressure of 0.25 mbar and an instrumental bandwidth of ca. 0.001 cm −1 . Four regions have been studied: a first one in the P -branch (906.849–907.687 cm −1 ), a second one in the Q -branch (910.407–910.944 cm −1 ), and two other ones in the R -branch (913.957–914.556 and 917.853–918.705 cm −1 ). The whole ν 1 / ν 8 dyad of SF 5 35 Cl has been previously recorded in the group of Professor H. Burger in Wuppertal, thanks to a Fourier transform infrared spectrometer [J. Mol. Spectrosc. 208 (2001) 169]. These data have thus been combined with our diode laser ones in the aim of refining the analysis. We used an effective Hamiltonian developed up to the fourth order and a set of programs called C 4 v TDS. One thousand three hundred and forty-six transitions for ν 1 , 495 (FTIR: 351; diode laser: 144) transitions for ν 8 , and 406 ground state combination differences have been assigned and fitted. A global fit has been obtained with a rms of 0.00081 cm −1 for the ν 1 band, 0.0012 cm −1 for the FTIR data of the ν 8 band, 0.00055 cm −1 for the diode laser data of this same band, and 0.00064 cm −1 for the ground state. It appears that more data (for instance, using a supersonic jet) are still necessary to obtain a completely satisfactory analysis of the ν 8 region.