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Photoemission studies of the metal-nonmetal transition of sodium on solid ammonia

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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Photoemission experiments were performed to investigate the properties of Na on solid ammonia. At low coverages of Na on solid NH/sub 3/ a nonmetallic feature of the Na 2p core level is seen at 33 eV binding energy, which is 2.4 eV deeper than that of the metallic Na 2p core level. This higher-binding-energy features is thought to be due to solvated Na atoms in the NH/sub 3/ matrix. At higher coverages it appears that a metallic phase of the Na atoms occurs, along with the appearance of a plasmon loss feature. It was found that the metal-nonmetal transition is associated with these two Na core-level features, coexisting at intermediate Na coverages. This regime is consistent with a phase-separation regime where metallic clusters coexist with a dilute phase which has Na solvated in the NH/sub 3/. Another fascinating feature of this Na--solid-NH/sub 3/ system is a work-function value as low as 0.9 eV when Na and NH/sub 3/ are codeposited at 80 K.

Research Organization:
Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000
OSTI ID:
6551231
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:3; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACCELERATORS
ALKALI METALS
AMMONIA
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
CYCLIC ACCELERATORS
DEPOSITION
ELEMENTS
EMISSION
ENERGY SPECTRA
FUNCTIONS
HYDRIDES
HYDROGEN COMPOUNDS
METALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NSLS
PHASE TRANSFORMATIONS
PHOTOEMISSION
RADIATION SOURCES
SECONDARY EMISSION
SODIUM
SPECTRA
SURFACE COATING
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
WORK FUNCTIONS