{'fraction_non_alphanumeric': 0.033648790746582544, 'fraction_numerical': 0.023133543638275498, 'mean_word_length': 4.8765432098765435, '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}}
Ar XVII line ratios in tokamak plasmas

Recent calculations of electron impact excitation rates in helium-like Ar XVII are used to derive the electron density and temperature sensitive emission line ratios R(=f/i) and G(=(f+i)/r), where f, i and r are the forbidden 1s2 1S-1s2s 3S, intercombination 1s2 1S-1s2p 3P1.2 and resonance 1s2 1S-1s2p 1P transitions, respectively. A comparison of these with the R and G ratios determined from an X-ray spectrum of the Alcator C tokamak, for which the electron density and temperature have been independently determined, reveals excellent agreement between theory and observation, with discrepancies of 2% and 4% in R and G, respectively. This provides experimental support for the accuracy of the atomic data adopted in the line ratio calculations, and implies that they may be applied with confidence to the analysis of remote sources for which no independent Ne and Te estimates exist, such as solar flares.