{'fraction_non_alphanumeric': 0.014925373134328358, 'fraction_numerical': 0.0024875621890547263, 'mean_word_length': 5.1923076923076925, '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}}
Theory for detection of 2D and 1D plasmon dispersion relations by ricochet electron energy loss spectra

When a beam of electrons is incident quasiparallel on the surface of a metal, on a two-dimensional electron gas, or on the axis of a one-dimensional electron gas, these electrons have a high probability of undergoing a ricochet scattering with excitation of a plasmon. The scattering cross section peaks along critical directions of emergence, which depend on the energy epsilon k of the scattered electrons. Experimental determination of these directions as a function of epsilon k can yield direct information on the plasmon dispersion relation. Numerical calculations are presented for ricochet scattering on the surface of aluminium, an accumulation layer on ZnO and a one-dimensional conductor.