The nu(6)+nu(10) band of ethane

A Fourier transform interferometer was used to record the slit-jet cooled overtone absorption spectrum of ethane around 2.3 mu m, at a spectral resolution of 0.01 cm(-1). The rotational temperature was determined to be 35 K. A band observed around 4343 cm(-1), of perpendicular type, was analysed. 139 lines were assigned to 7 different subbands. One of these subbands, K'Delta K = -2, shows torsional splittings. Effective rotational parameters were obtained for each subband. A strong perturbation obscures the K'Delta K= + 1 subband, which thus could not be assigned. The Vibrational band was assigned to the nu(6) + nu(10) combination band on the basis of the Coriolis zeta constant, which was found to be zeta(6+10) = 0.26(3). The band origin was determined to be nu(6+10)(0) = 4342.56(25) cm(-1). (C) 1997 Published by Elsevier Science B.V.