{'fraction_non_alphanumeric': 0.021479713603818614, 'fraction_numerical': 0.00954653937947494, 'mean_word_length': 4.7534246575342465, '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}}
Direct TEM observation of amorphous Si created by femtosecond laser irradiation

This work performs a cross-sectional TEM study of holes in Si using a femtosecond laser, and observes the structure directly. Under bright-field TEM mode, a 20 to 30 nm thick amorphous layer on the silicon surface inside the hole is observed. Furthermore, an electron dispersive X-ray study proves that this layer does not contain oxygen.