{'fraction_non_alphanumeric': 0.03412073490813648, 'fraction_numerical': 0.015748031496062992, 'mean_word_length': 4.7368421052631575, '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}}
Subpicosecond time-resolved x-ray measurements

The emission of ultrashort thermal x-ray radiation is shown to be controlled by two factors; peak temperature and the population of `cold' electrons. Two experiments are used to illustrate these mechanisms. The first measures the time history of 50 angstroms - 130 angstroms x-rays from ultrashort pulse laser heated solid targets. This experiment is used to illustrate the effect of the peak temperature on the full width at half maximum of the emission. The second experiment measures the dependency of decay time of the 1s2(S0) - 1s2p(1P1) transition (He(alpha )) emission on target thickness. This is used to infer the effects of unheated material or `cold' electrons on the time history of the x-ray emission.