Assignment of coherent anti-stokes Raman spectra of the ν1 bands of ammonia: 14ND3 and 15ND3

Abstract High-resolution FTIR spectra of the ν 1 bands of both 14 ND 3 and 15 ND 3 species were recorded with the Bruker spectrometer in Giessen. The spectra were assigned using the interactive program combining the Loomis-Wood technique with ground state combination difference checks. New sets of molecular constants of the ν 1 vibrational levels of both isotopomers are presented. The ν 1 rovibrational energies derived from the frequencies of the assigned transitions have made possible calculations of the Raman transition frequencies required for a simulation of the Coherent Anti-Stokes Raman Scattering (CARS) spectra. A satisfactory agreement of the simulated CARS spectra with the experimental ones was achieved.