摘要:
With a new method it was possible to generate DCNO in amounts practical for high resolution spectroscopy. DCNO is spectroscopically the most interesting isotopically substituted species of the quasilinear molecule fulminic acid, HCNO. Both DCNO and the parent isotopomer were reinvestigated in the far infrared region. The rovibrational spectra were recorded with a Bruker IFS 120 HR interferometer with resolutions (1/MOPD) between 0.0017 and 0.0028 cm(-1). The nu(5) fundamental and many hot bands of both isotopomers could be assigned. The spectral lines were weighted according to their signal-to-noise ratio for use in subsequent fitting procedures. Spectroscopic parameters of an effective Hamiltonian for linear molecules were adjusted for the vibrational states (nu(1)nu(2)nu(3)nu(4)nu(5)) = (00000), (00001), (00002), (00003), (00004) of DCNO and (nu(1)nu(2)nu(3)nu(4)nu(5)) = (00000), (00001), (00002), (00011), (00010), (00003) of HCNO. The search for the nu(4) fundamental of DCNO was not yet successful. The now well known Coriolis resonance between the states (00002) and (00010) seen in HCNO does not effect the spectrum of DCNO. However, a new resonance was observed in DCNO between the levels with l = 0 and 2 of the (00001) state and the two pairs of levels with l = 1 of the (00012) state. (C) 2000 Elsevier Science B.V. All rights reserved.