Photofield Emission Spectroscopy of Ba on W |
| T. Radoń and S. Jaskółka Institute of Experimental Physics, University of Wrocław, Pl. Maxa Borna 9, 50-204 Wrocław, Poland |
| Received: September 19, 1994; in final form: January 20, 1995 |
| Full Text PDF |
| Optical transitions in photofield emission from barium covered tungsten were observed. The initial energies of the excited electrons obtained for different crystallographic planes range near the values of s₁ = -0.07 ± 0.02 eV and s₂ = -0.28 ± 0.04 eV with respect to the Fermi level. The energies are ascribed to electrons in the thin barium layer. The work functions of the barium covered tungsten (100), (111) and (100) planes were estimated using field emission method. In order to measure very small photocurrents a modulated laser radiation and the phase-sensitive detection were used. |
| DOI: 10.12693/APhysPolA.87.657 PACS numbers: 73.20.-r, 79.70.+q |