{'fraction_non_alphanumeric': 0.03540519276160504, 'fraction_numerical': 0.03697875688434304, 'mean_word_length': 4.781818181818182, '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}}
Addition of OH to Acetylene and Consecutive Reactions of the Adduct with O2

The reaction of hydroxyl with acetylene (proceeding mainly by addition), and reactions of the adduct with 02 are studied, using the VUV flash photolysis/resonance fluorescence technique in Ar at 127 mbar and temperatures between 294 and 353 and between 16 and 260 mbar at room temperature. The rate constant for the reaction of OH with acetylene is determined to be k(T) = (1.2 ± 0.2) · IO"12 exp(-(204 ± 41) K/T) cm3 s_1 at 127 mbar in good agreement with literature data, and the pressure dependence is confirmed. Although the adduct is thermally stable, biexponential decays of OH are observed throughout, even at the lowest levels of 02 attained. This can be explained by the occurrence of two reaction channels of the adduct with 02, one of them regenerating OH. The rate constants derived, using the analytical solution of the corresponding rate equations for OH and the adduct, are partly degenerate. The OH-regenerating channel predominates with a rate constant of (42 ± 5) · 10"13 cm3 s~' at room temperature with a slightly negative temperature coefficient, independent of pressure (where the error limits include the uncertainty introduced by the degeneracy). Upper limits between 17