Two-extremum electrostatic potential of metal-lattice plasma and the work function of an electron

• Autorzy: Surma S. A. , Brona J. , Ciszewski A.

Identyfikatory

DOI

10.1515/msp-2015-0035

• Języki publikacji: EN

Abstrakty

EN

Metal-lattice plasma is treated as a neutral two-component two-phase system of 2D surface and 3D bulk. Free electron density and bulk chemical potential are used as intensive parameters of the system with the phase boundary position determined in the crystalline lattice. A semiempirical expression for the electron screened electrostatic potential is constructed using the lattice-plasma polarization concept. It comprises an image term and three repulsion/attraction terms of second and fourth orders. The novel curve has two extremes and agrees with certain theoretical forms of potential. A practical formula for the electron work function of metals and a simplified schema of electronic structure at the metal/vacuum interface are proposed. This yields 10.44 eV for the Fermi energy of free electron gas; ~5.817 eV for the Fermi energy level; 4.509 eV for the average work function of bcc tungsten. Selected data are also given for fcc Cu and hcp Re. For harmonic frequencies 10E16 per s of the self-excited metal-lattice plasma, energy gaps of 14.54 and 8.02 eV are found, which correspond to the bulk and surface plasmons, respectively. Further extension of this thermodynamics and metal-lattice theory based approach may contribute to a better understanding of theoretical models which are employed in chemical physics, catalysis and materials science of nanostructures.

Słowa kluczowe

EN

under-coordinated system; surface; interface; screened potential; metal-lattice plasma density; work function; electron affinity

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2015
• Tom: Vol. 33, No. 2
• Strony: 430--444
• Opis fizyczny: Bibliogr. 55 poz., rys., tab.

Twórcy

autor

Surma S. A.

• Institute of Experimental Physics, University of Wroclaw, Plac Maxa Borna 9, 50-204 Wroclaw, Poland

autor

Brona J.

• Institute of Experimental Physics, University of Wroclaw, Plac Maxa Borna 9, 50-204 Wroclaw, Poland

autor

Ciszewski A.

• Institute of Experimental Physics, University of Wroclaw, Plac Maxa Borna 9, 50-204 Wroclaw, Poland

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