{'fraction_non_alphanumeric': 0.04404567699836868, 'fraction_numerical': 0.026101141924959218, 'mean_word_length': 4.385964912280702, '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}}
Electron spin resonance spectra of Eu2+ and Tb4+ ions in glasses

Electron spin resonance (ESR) spectra of Eu2+ and Tb4+ were observed at room temperature in one fluoride phosphate and two phosphate glasses. Although both ions are isoelectronic, they have different ESR spectra. Eu2+ ions exhibit pronounced features at effective g-values of 2.0, 2.8 and 6.0, which is typical for the so-called U-spectrum. Tb4+ ions give only a single feature at g = 5.0. The different spectra are due to different crystal field strengths. The higher charge of Tb4+ ions results in a stronger local field compared with Eu2+ ions.