FTIR Spectroscopy of the ν_4 Bands of 14NO_3 and 15NO_3
Abstract
High-resolution Fourier transform infrared spectra of the NO_3 ν_4 bands of 14N and 15N isotopic species were observed in the 365 and 360 cm-1 region. Observed lines were used to determine
ΔK=3 combination differences of the ground state coupled with transition frequencies of the ν_3 hot band ν_3 + ν_4 - ν_4 in 1127 cm-1 region and ν_3 + ν_4 band in 1492 cm-1 region, which made it possible to determine the rotational C_0 constants of 0.228 6321(67) cm-1 and 0.228 674(11) cm-1 for 14NO_3 and 15NO_3 , respectively. Inertial defects of several vibrational states were calculated by using a formula of Jagod and Oka and compared with the observed values. Although the observed Coriolis coupling constants ζ_4=-0.188 (14NO_3 ) and -0.156 (15NO_3 ) are largely different from the expected value of -0.7 from a force field calculation, observed inertial detects are in good agreement with calculated values, for example, Δobs(Gr.)= 0.206 [0.223] amuÅ^2, (v_4=1) 0.434[0.437] amuÅ^2 etc, where calculated values are given in square brackets. K. Kawaguchi, N. Shimizu, R. Fujimori, J. Tang, T. Ishiwata, and I. Tanaka, J. Mol. Spectrosc. 268, 85 (2011). M.-F. Jagod and T. Oka, J. Mol. Spectrosc. 139, 313 (1990).- Publication:
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67th International Symposium on Molecular Spectroscopy
- Pub Date:
- June 2012
- Bibcode:
- 2012mss..confETI04F
- Keywords:
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- RADICALS AND IONS