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Atmospheric and Oceanic Optics

2014 year, number 1

On the ambiguity of intermolecular interaction potential determined from the spectroscopic data

V.I. Starikov1,2
1Tomsk State University of Control Systems and Radioelectronics, 40 Lenina Prospect, Tomsk, 634050, Russia
2Yurginskiy Technological Institute (branch) of the Tomsk Polytechnic University, 652055, Kemerovo region, Jurga, Leningradskaya st., 26
Keywords: intermolecular potential, half-widths, NH3–Ar, NH3–He


It was shown that interaction potentials for the NH3–Ar and NН3–Не systems are determined ambiguously from the experimental data for the broadening coefficients γ of absorption spectral lines of NH3 molecule. The different sets of model interaction potential given the same accuracy of calculation of coefficients γ for room temperature determine these coefficients for other temperatures in different ways. This difference is more visible for the NН3–Не system. For NH3–Ar system this difference becomes apparent for the lines with small value of rotational quantum number K, for KJ this effect decreases.