Collision Broadening of Rotational Absorption Lines. IV. Pressure Broadening of the Ammonia Inversion Spectrum

The collision broadening of the NH3 inversion spectrum was investigated within the framework of an earlier proposed theory of pressure broadening. The original treatment must be modified before application to NH3 to allow for the fact that NH3 has two closely spaced energy levels, the inversion doub...

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Published in:The Journal of chemical physics 1969-04, Vol.50 (8), p.3320-3329
Main Authors: Murphy, Joseph S., Boggs, James E.
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Language:English
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description The collision broadening of the NH3 inversion spectrum was investigated within the framework of an earlier proposed theory of pressure broadening. The original treatment must be modified before application to NH3 to allow for the fact that NH3 has two closely spaced energy levels, the inversion doublet, with all other levels very widely spaced. This situation results in a “two-level resonance” system which greatly affects the linewidth. In general, the agreement between the calculated and experimental values is very good although the calculated values tend to be slightly smaller. Molecular quadrupole moments for N2 and H2 are determined from linewidth data for broadening of NH3 inversion lines and are in excellent agreement with values determined by other methods.
doi_str_mv 10.1063/1.1671556
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title Collision Broadening of Rotational Absorption Lines. IV. Pressure Broadening of the Ammonia Inversion Spectrum
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