{'fraction_non_alphanumeric': 0.019011406844106463, 'fraction_numerical': 0.0, 'mean_word_length': 4.728260869565218, '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}}
A nozzle beam source for the production of metastable rare gas atoms

An atomic beam source for the production of metastable rare gas atoms is presented. The set-up is based on a supersonic gas expansion combined with a negative point-to-plane discharge. In contrast to similar devices, there are no perturbing electromagnetic fields in the low-pressure region. The properties of the discharge and the flux of metastables as functions of the discharge parameters have been investigated. Results for helium and argon are shown.