Abstract
Double-resonance ionization spectra via selected rotational levels of the C̃′ 1 A′(0100) state of ammonia show direct evidence for rotational-electronic perturbations between Rydberg series converging to different rotational states of NH 3 + X̃ 2 A 2″ (0100), and for rotational autoionization when it is energetically allowed. The simplicity of the double resonance spectra is quite striking, and rotational interactions with Δ N +=−1, Δ K +=0 are found to be most important. The results have implications for understanding intensities in rotationally resolved threshold photoelectron spectra and for extracting ionization onsets from photoionization mass spectra.
Published Version
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