EXPERIMENTAL AND THEORETICAL INVESTIGATION OF FOREIGN GAS BROADENING OF AMMONIA TRANSITIONS OF THE $\nu_{2}(1-0)$ AND $\nu_{2}(2-1)$ BANDS
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Date
1983
Journal Title
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Publisher
Ohio State University
Abstract
We have measured the broadening of several rotovibrational transitions of the $\nu_{2}$ band of $NH_{3}$ caused by collisions with foreign gases as $He, H_{2}$ and $N_{2}$. As expected the values of pressure broadening are smaller than those measured previously in the case of self broadening $^{(1)}$. However, a smaller broadening infers a smaller impact parameter so that the Anderson’s approximation in the frame of the impact theory begings to fail. Nevertheless, we are trying to apply this theory in the case of $N_{2}$-broadening, because of the slight bigger values of the impact parameter with respect to the other gases. The results of such calculation will be presented along with a critical analysis of the experimental data. (1) G. Baldacchini, G. Buffa, S. Marehetti, V. Montelatiei and O. Tarrini: J. Chem. Phys. 76, 5271 (1982); same authors with V. Sorge; J. Chem. Phys. (1983)
Description
Author Institution: Dip. TIB-FIB, Laboratorio Spettroscopia Molecolare; Dip. TIB-FIB, C. N. R.; (=) Istituto di Fisca, Universi\'e di Pisa