{'fraction_non_alphanumeric': 0.01740294511378849, 'fraction_numerical': 0.002677376171352075, 'mean_word_length': 5.131147540983607, '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}}
Nondiagonal Response of Electrons by Coherent Inelastic X-Ray Scattering

Abstract The experimental knowledge of the dielectric response of electrons within a solid is up to now mainly gained by inelastic scattering experiments, using a plane wave as initial state of the probe particle. These experiments allow the measurement of the dynamical structure factor, related to diagonal elements of the inverse dielectric matrix ε-1. We present a new type of scattering experiment that uses as initial state of the probe a standing wave field, thus allowing the experimental determination of non-diagonal elements of ε-1. Comparison of the experimental results with a plasmon-band model leads to direct experimental evidence for plasmon-banding in Si.