ROTATIONAL AND ROVIBRATIONAL SPECTRA OF (HCNO)-C-13-N-15 IN THE SPECTRAL REGIONS 18-40 GHZ, 110-440 GHZ, AND 170-1850 CM

The pure rotational and rovibrational spectra of (HCNO)-C-13-N-15, an isotopically substituted species of the quasilinear molecule fulminic acid, were investigated by means of microwave, millimeter-wave, and Fo urier-transform infrared spectroscopy. The pure rotational spectra wer e measured in the spectral regions from 18 to 40 GHz and from 110 to 4 40 GHz. Direct l-type transitions were also observed in the region fro m 18 to 40 GHz. Approximately 500 line positions with microwave accura cy (10-401 kHz) were obtained in these spectral regions. The rovibrati onal spectrum was recorded in four segments covering the range from th e far-infrared to the mid-infrared, 170-1850 cm(-1), using a Bruker IF S 120 HR interferometer with resolutions between 0.0017 and 0.0028 cm( -1). In total, more than 13 000 infrared lines were assigned. Power se ries constants for the assigned transitions are given. Spectroscopic p arameters of an effective Hamiltonian for linear molecules were adjust ed for the vibrational states (upsilon(1) upsilon(2) upsilon(3) upsilo n(4) upsilon(5)) = (00000), (00001), (00002), (00003), (00004), (00010 ), (00011), (00100), and (00101). Several accidental resonances, known from other isotopomers of fulminic acid, were analyzed and the isotop ic dependence of the resonance effects compared. The treatment of a ca libration problem, which became obvious when data from the different i nfrared spectra were fitted simultaneously, is discussed. (C) 1996 Aca demic Press, Inc.