Fourier transform emission spectroscopy of the near infrared transitions of CeS

The emission spectra of CeS have been investigated at high resolution with a Fourier transform spectrometer. Several bands observed in the 4000-9000 cm(-1) region have been classified into nine transitions having five different lower states, X-1(3), X-2(>= 2), X-3(>= 2), X-4(>= 3) and X-5(0) based on Omega doubling and relative branch intensities. Out of these, the [7.54] (4) -> X-1(3) transition consisting of 0-1, 1-2, 0-0, 1-1, 1-0 and 2-1 bands is strongest in intensity. A rotational analysis of these bands provides equilibrium spectroscopic constants: omega(e) = 461.3947(14) cm(-1), omega(e)x(e) = 1.00095(65) cm(-1), B-e = 0.118782207(15) cm(-1), alpha(e) = 0.000341453(14) cm(-1) and r(e) = 2.33522875(15) angstrom for the lower X-1(Omega = 3) state. The [8.78] (>= 3) -> X-2(>= 2) transition, for which 0-0 and 0-1 bands were rotationally analyzed, provides Delta G(1)/(2) = 458.87411(88) cm(-1), B-e = 0.1187649(31) cm(-1), alpha(e) = 0.0003401(37) cm(-1) and r(e) = 2.335399(31) angstrom for the X-2(Omega >= 2) lower state. (C) 2014 Elsevier Inc. All rights reserved.