Photodetachment spectroscopy of cold trapped NH-2 near threshold.

We have studied photodetachment of the amidogen anion NH^-2 as a function of photon energy near the detachment threshold. The detachment spectrum is obtained over the energy range of 6190-6355 cm^-1 from the loss rate of the anions from a cryogenic radiofrequency multipole ion trap. By modeling all accessible rotational state-to-state photodetachment transitions, we can assign rotational state-specific thresholds to the measured spectrum. In thisway, we have determined the electron affinity of NH2 to be 6224 ± 1 cm^-1. © 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license. [ABSTRACT FROM AUTHOR]