The High-Resolution Infrared Spectrum of the ν4, ν5, and ν6 Bands of trans-Di-imide Revisited

✍ Scribed by F. Hegelund; H. Burger; O. Polanz

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 477 KB
• Volume: 167
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1214

✦ Synopsis

The gas-phase IR spectra of the fundamental band (\nu_{5}) around (3100 \mathrm{~cm}^{-1}) and the (a, b)-Coriolis interacting band systen (\nu_{4}, \nu_{6}) around (1300 \mathrm{~cm}^{-1}) of (\mathrm{N}{2} \mathrm{H}{2}) have been recorded with a resolution of ca. 0.008 and (0.005 \mathrm{~cm}^{-1}), respectively. In (v_{5}) and (\nu_{6}) an (a) as well as a (b) component are observed. In (v_{4}) a (c) component and a parallel component which obtains its intensity from the strong (a) Coriolis resonance with (\nu_{6}) are observed. Both in (\nu_{4}) and in (\nu_{6}) we have also identified additional transitions with (\Delta K_{a}= \pm 2), which are due to strong (b)-Coriolis interaction. From a simultaneous analysis of ground state combination differences from the three bands the following ground state rotational constants have been derived: (A_{0}=10.001203(5) \mathrm{cm}^{-1}, B_{0}=1.3043373(6) \mathrm{cm}^{-1}), and (C_{0}=1.1499757(6) \mathrm{cm}^{-1}). The (\nu_{4}, \nu_{6}) band system has been analyzed by a dyad model which takes into account the (a) - and (b)-Coriolis resonances between the levels. For the analysis of the (\nu_{5}) band a weak (a)-Coriolis interaction with the combination band (\nu_{2}+\nu_{4}) is included. Upper state spectroscopic constants for the (\nu_{4}, \nu_{5}), and (\nu_{6}) levels and a number of interaction constants have been determined from these analyses. c. 1994 Academic Press. Inc.