{'fraction_non_alphanumeric': 0.02392947103274559, 'fraction_numerical': 0.0025188916876574307, 'mean_word_length': 4.802919708029197, '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}}
A central peaks as a pre-melting feature in NaNO3 spectra

The quasi-elastic and Raman spectra of NaNO3 are studied as a function of scattering configuration and temperature through the phase transition up to the close vicinity of the melting temperature. Results reveal the appearance of broad intense quasi-elastic scattering in the (ZZ) and (YX) spectra when the transition is approached from below. The slightly soft-phonon Eg lines detected in the (YZ) spectrum in the low-temperature phase are shown to persist above Tc. Neither the central peak, nor the phonon Eg modes seem to be connected with the transition to the high-temperature phase which is only partly disordered. Rather, the relaxational central peak is found to be related to the disordering process precursor of the melting.