The fundamental bands in the infrared spectrum of stibine (SbH3)

The infrared spectrum of stibine. SbH3, has been recorded in the regions between 720 and 1000 cm(-1) and between 1750 and 2020 cm(-1) at a resolution of about 0.004 cm(-1). Rovibrational transitions belonging to the v(2), v(4) bending and v(1), v(3) stretching fundamental bands have been measured and assigned for both Sb-121 and Sb-123 isotopomers. Strong perturbations due to rovibrational interactions ha e been observed both in the bending and in the stretching bands. Splittings of the K" = 3, 6, and 9 lines have been observed and perturbation-allowed transitions with selection rules Delta(k - l) = +/-3, +/-6, and +/-9 have been also identified. Simultaneous analyses of transitions belonging to the v(2)/v(4) or v(1)/v(3) dyads have been performed. The central frequencies of the hyperfine structures of the rotational transitions in the v(2) = 1 and v(4) = 1 states, recorded in the microwave region by Fourier transform spectroscopy [H. Harder. C. Gerke. and L. Fusina. J. Chem. Phys. 114, 3508-3523 (2001)], have been included in the data set. The theoretical model adopted explicitly takes into account the Coriolis interactions between the v(1) = 1 (A(1)) and v(3) = 1 (E) and between the v(2) = 1 (A(1)) and v(4) = 1 (E) states, including also several essential resonances within them. (C) 2002 Elsevier Science (USA).