Microwave optical double resonance spectrum of NH2. II. Collision-induced transitions in ? 2A1 and observations of a new vibronic state

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Abstract
Strong microwave optical double resonance (MODR) signals have been observed for NH2 around 6.4 GHz and 15.7 GHz. These transitions occur between a previously unobserved rovibronic level and, respectively, the J=1/2 and J=3/2 spin–rotational levels of 110, ? 2A1 π (0,10,0). This previously unknown level has been tentatively assigned as the 220, J=3/2, ? 2B1 (0,12,0). The N and J assignments are certain, the Ka is fairly certain, and the vibronic assignment is very tentative. In addition to MODR signals observed by direct laser excitation of the levels involved in the microwave transition, these microwave transitions are MODR active when a number of rotational levels of the ? 2A1 (0,10,0) band are excited. These collision‐induced signals are interpreted qualitatively in terms of a simplified model. Observations of the collision‐induced transition (tentatively assigned as) 220, J=3/2←322, J=5/2, ? 2B1 (0,12,0) are also reported.
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