Infrared Laser Spectroscopy of the nu4 and nu9 Band System of CH2F37Cl.
The spectra of CH2F37Cl (95% isotopically pure sample) have been recorded at high resolution with a tunable diode laser spectrometer in the regions 979-1030 and 1108-1136 cm-1. The spectral analysis allowed us to assign about 2000 lines (J </= 61, Ka </= 26) of the nu9 band (nu0 = 1001.9360 cm-1), which, besides the expected c-type component, shows a more intense Coriolis-induced parallel component deriving its intensity from mixing with the nu4 vibrational state. In addition, the assignments of the nu4 band (nu0 = 1067.7138 cm-1), previously investigated, have been extended to higher Ka values and about 1300 new lines (J </= 69, 17 </= Ka </= 26) have been identified. The nu4 and nu9 bands have been fitted simultaneously to account for the first-order a- and b-type Coriolis coupling; interaction constants and excited state parameters up to the sextic terms have been obtained using Watson's A-reduction Hamiltonian in the Ir representation. Copyright 1999 Academic Press.
Baldacci
A
Dipartimento di Chimica Fisica, Università di Venezia, D.D. 2137, Venice, I-30123, Italy
Stoppa
P
Giorgianni
S
Ghersetti
S