FOURIER-TRANSFORM SPECTROSCOPY OF THE NU(3) AND NU(6) BANDS OF (D3SICL)-CL-35 - ROVIBRATIONAL CONSTANTS OF THE V=0, V(3)=1, AND V(6)=1 STATES

The nu(3) and nu(6) infrared bands near 500 cm(-1) of monoisotopic (D3 SiCl)-Cl-35 have been studied with a resolution of 3.3 x 10(-3) cm(-1) . More than 800 transitions of nu(3) and 2600 of nu(6) have been assig ned and fitted to ground and excited state parameters, sigma(Fit) = 2. 93 x 10(-4) cm(-1). Ground state parameters up to quartic terms have b een obtained. The excited state model included l(2, 2) and l(2, -1) in teractions within nu(6) and Coriolis x, y resonance between nu(3) and nu(6), interaction parameters being determined with high significance in all cases. The band centers nu(0) were determined, nu(3) = 538.502 cm(-1) and nu(6) = 491.260 cm(-1). Excellent agreement of experimental parameters with those from the ab initio harmonic and anharmonic forc e fields is noted. The transition moment ratio, \mu(3):mu(6)\ = 1:0.6( 1), was determined by band contour simulation. (C) 1998 Academic Press .