Beam maser investigation of inelastic scattering of NH3. II. Cross sections for rotational transitions induced by polar gases

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Abstract
A molecular beam maser is used in a double‐resonance scheme to measure cross sections for rotational transitions between levels of different inversion doublets of NH3 induced by collisions with NH3, CH3F, and CF3H. Theoretical values, calculated with a modification of Anderson’s theory, are in good agreement with present experimental results and steady‐state double‐resonance experiments of Oka [J. Chem. Phys. 48, 4919 (1968)].