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4 BANDS OF 14NO3 and 15NO3 .
R. FUJIMORI, N. SHIMIZU, J. TANG, K. KAWAGUCHI, Department of Chemistry, Faculty of Science, Okayama University, 3-1-1, Tsushima-Naka, Okayama 700-8530, Japan; T. ISHIWATA, Graduate School of Information Sciences, Hiroshima City University, 3-4-1 Otsuka-Higashi, Hiroshima 731-3194, Japan,.
High-resolution Fourier transform infrared spectra of the NO3
4 bands of 14N and 15N isotopic species were observed in the 365 and 360 cm-1 region. Observed lines were used to determine
K=3 combination differences of the ground state coupled with transition frequencies of the
3 hot band
3 +
4 -
4 in 1127 cm-1 region and
3 +
4 band in 1492 cm-1 region, which made it possible to determine the rotational C0 constants of 0.228 6321(67) cm-1 and 0.228 674(11) cm-1 for 14NO3 and 15NO3 , 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
4=-0.188 (14NO3 ) and -0.156 (15NO3 ) 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,
obs(Gr.)= 0.206 [0.223] amuÅ2, (v4=1) 0.434[0.437] amuÅ2 etc, where calculated values are given in square brackets.