{'fraction_non_alphanumeric': 0.05711987127916331, 'fraction_numerical': 0.06355591311343524, 'mean_word_length': 4.293617021276596, '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}}
Emission cross section of O I (135.6 nm) at 100 eV resulting from electron‐impact dissociative excitation of O2

In this Letter, we report for the first time, the ratio of the O I (135.6 nm)/O I (130.4 nm) absolute emission cross sections from electron‐impact dissociative excitation of O2 at 100 eV using facilities located at the University of Colorado, Laboratory for Atmospheric and Space Physics (LASP). The O I (135.6 nm) emission glow produced in the laboratory from the long‐lived transition O I g³P ← 5S° was measured in a large collision chamber (1m diameter) with a long focal length (50 cm) electrostatic electron gun. The ratio of the absolute emission cross sections of the O I (135.6 nm) and O I (130.4 nm) features resulting from electron‐impact dissociative excitation of O2 at 100 eV was found to be 2.3±0.6. From this ratio, the absolute emission cross section for the O I (135.6 nm) feature at 100 eV electron‐impact energy was determined to be (6.4±2.2)×10−18 cm². The O I (135.6 nm) cross section reported here can be used to better understand the recent Hubble Space Telescope observations of the O I (130.4 nm) and O I (135.6 nm) emission intensities from Ganymede [Feldman et al., 2000] and Europa [Hall et al., 1995].