Inversion and inversion-rotation spectrum of 14NH3 in the ν2 excited state |
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Authors: | SP Belov LI Gershstein AF Krupnov AV Maslovskij ? Urban V ?pirko D Papou?ek |
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Institution: | Institute for Applied Physics, Academy of Sciences of the USSR, Gorkii, USSR;The J. Heyrovský Institute of Physical Chemistry and Electrochemistry, Czechoslovak Academy of Sciences, prague, Czechoslovakia |
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Abstract: | Using the vibration-inversion-rotation Hamiltonian for ammonia V. ?pirko, J. M. R. Stone, and D. Papou?ek, J. Mol. Spectrosc.60, 159–178 (1976)], a modified theory is worked out for the Δk = ±3n interactions between the inversion-rotation energy levels of NH3 which takes into account the large amplitude inversion motion. Eighty frequencies of inversion and inversion-rotation transitions and two perturbation-allowed transitions in the ν2 state of 14NH3 are measured in the far-infrared region around 1 THz (≈33 cm?1), mostly with the microwave accuracy, by the radiofrequency spectrometer with acoustic detector. By a least-squares fit of these data and the data of the infrared-microwave two-photon and infrared heterodyne measurements of the ν2 band, a set of molecular constants for the ν2 state of 14NH3 is obtained which reproduces the submillimeterwave data with the accuracy of the experiment. |
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