{'fraction_non_alphanumeric': 0.019313304721030045, 'fraction_numerical': 0.0, 'mean_word_length': 3.9157894736842107, '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}}
Stability of D- centers in GaAs.

Some of the reasons for the lack of stability of the D - centers in bulk GaAs are considered using the idea of screening. Screening due to other impurity electrons tends to reduce the binding energy of D - centers much faster than that of neutral donor centers. Estimates of optical-matrix elements and the order of temperatures needed for the dissociation of the D - ion show why it is difficult to observe D - centers in bulk GaAs