{'fraction_non_alphanumeric': 0.03350515463917526, 'fraction_numerical': 0.023195876288659795, 'mean_word_length': 4.55, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Differential cross section for H- and NH2- ions in NH3

Differential cross section and kinetic energy distributions of H- and NH2- ions produced by dissociative attachment around 5.6 eV in ammonia have been obtained. Both H- and NH2- cross sections show a series of overlapping peaks starting at 4.94 eV with a mean spacing of 115 meV, attributed to the out-of-plane vibrational quanta n nu 2 of a NH3- resonance state. A predissociation mechanism similar to the predissociation of the lowest excited singlet state 1A2 of neutral ammonia, parent of the resonance state, and a charge transfer between two A' resonance states leading to the NH2+H- and NH2-+H products at infinite separation, in a distorted dissociation mechanism (Cs), account for the experimental observations.