Abstract
Rates for inelastic collision-induced transitions between rotation–inversion states are measured for the NH3 molecule colliding with He atoms and with N2 molecules. An infrared–microwave double resonance method is used to determine differences within pairs of collisional transition rates connecting different inversion pairs in the ground (ν2=0) vibrational manifold of NH3. The measured rates are analyzed for parity, and J and k selection rules. The results are consistent with Oka’s saturation experiments on NH3, but in some respects inconsistent with theoretical calculations of collisional transition rates.
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