{'fraction_non_alphanumeric': 0.037037037037037035, 'fraction_numerical': 0.030864197530864196, 'mean_word_length': 4.293478260869565, '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}}
Multiphoton Ionization of Xe and Kr Atoms by an ArF Excimer Laser

The dependence of ionization signals of Xe and Kr atoms on the laser intensity has been studied using an ArF excimer laser. For both atoms, we observe a slope of 2 in the log-log plot of the ionization signal versus laser intensity, and saturation of ionization at laser pulse energies higher than about 100 mJ (1.7×1010 W/cm2). The ionization of Kr can be interpreted as a 2-photon-resonant, 3-photon (2+1) ionization.