Charge inhomogeneity in an expanded fluid metal: X-ray Compton scattering observation. (28th February 2017)

• Record Type: Journal Article
• Authors: Matsuda, K.; Kimura, K.; Nagao, T.; Hagiya, T.; Kajihara, Y.; Inui, M.; Tamura, K.; Katoh, M.; Itou, M.; Hiraoka, N.; Sakurai, Y.
• Is Part Of: Europhysics letters. Volume 117:Number 1(2017:Jan.)
• Publication Date: 2017-02-28
• Subjects: 71.22.+i -- 71.30.+h; Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1209/0295-5075/117/17004
• Languages: English
• ISSNs: 0295-5075

Abstract

Abstract: X-ray Compton scattering measurements have been carried out for fluid rubidium (Rb) from near the melting point up to the critical regions. The electron kinetic energy (KE) was derived from the valence Compton profiles and its relative variation as a function of the fluid density was compared with that of the electron gas model. Reduction in the KE occurs more slowly than that predicted by the model as the fluid density decreases and an apparent deviation in the KE from the model is observed at the densities where the fluid is still metallic. These findings suggest that a fluctuation intrinsic to the low-density electron gas causes charge inhomogeneity in valence electrons in real fluid rubidium, being coupled with ionic density fluctuations.