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- W2000506070 abstract "Ultraviolet photoemission spectroscopy with hv < 12 eV has been used to study O2, CO, and H2 adsorption on the cleaved GaAs(110) face. It was found that O2 exposures above 105 L(1LM = 10−6 Torr sec) were required to produce changes in the energy distribution curves. At O2 exposures of 106 L on p-type and 108 L on n-type an oxide peak is observed in the EDC's located 4 eV below the valence band maximum. On p-type GaAs, O2 exposures cause the Fermi level at the surface to move up to a point 0.5 eV above the valence band maximum, while on n-type GaAs O2 exposures do not remove the Fermi level pinning caused by empty surface states on the clean GaAs. CO was found to stick to GaAs, but to desorb over a period of hours, and not to change the surface Fermi level position. H2 did not affect the EDC's, but atomic H lowered the electron affinity and raised the surface position of the Fermi level on p-type GaAs. A correlation is found in which gases which stick to the GaAs cause an upward movement of the Fermi level at the surface on p-type GaAs, while gases which stick only temporarily do not change the surface position of the Fermi level." @default.
- W2000506070 created "2016-06-24" @default.
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- W2000506070 date "1976-02-01" @default.
- W2000506070 modified "2023-09-24" @default.
- W2000506070 title "Photoemission study of the adsorption of O2, CO and H2 on GaAs(110)" @default.
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- W2000506070 doi "https://doi.org/10.1016/0039-6028(76)90223-5" @default.
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