Oxygen chemisorption on Al: Unoccupied extrinsic surface resonances and site-structure determination by surface soft-x-ray absorption. Bianconi, A., Bachrach, R. Z., & Flodström, S. Physical Review B, 19(8):3879–3888, April, 1979.
Oxygen chemisorption on Al: Unoccupied extrinsic surface resonances and site-structure determination by surface soft-x-ray absorption [link]Paper  doi  abstract   bibtex   
Surface soft-x-ray absorption (SSXA) spectroscopy using synchrotron radiation has been applied to study oxygen chemisorption on aluminum (100), (110), and (111) single-crystal surfaces. Evidence is presented of oxygen-related extrinsic surface resonances above the Fermi level on all faces. From analysis of the SSXA spectra over a large energy range, local structural informatin has been obtained. The Al (111) surface exhibits a SSXA spectrum dominated by the core transitions to the antibonding states of the Al-O complex in the chemisorption phase. Evidence of a chemisorption phase at oxygen exposures below 50 L has also been obtained for the Al (100) surface. Different charge transfer from Al to O occurs on the two faces, and we suggest the formation of an Al-O complex on the Al(100) with a small charge transfer from Al to O. The transition to the formation of Al 2 O 3 has been characterized by the appearance of the oxide core exciton.
@article{bianconi_oxygen_1979,
	title = {Oxygen chemisorption on {Al}: {Unoccupied} extrinsic surface resonances and site-structure determination by surface soft-x-ray absorption},
	volume = {19},
	issn = {0163-1829},
	url = {http://dx.doi.org/10.1103/physrevb.19.3879},
	doi = {10.1103/physrevb.19.3879},
	abstract = {Surface soft-x-ray absorption (SSXA) spectroscopy using synchrotron radiation has been applied to study oxygen chemisorption on aluminum (100), (110), and (111) single-crystal surfaces. Evidence is presented of oxygen-related extrinsic surface resonances above the Fermi level on all faces. From analysis of the SSXA spectra over a large energy range, local structural informatin has been obtained. The Al (111) surface exhibits a SSXA spectrum dominated by the core transitions to the antibonding states of the Al-O complex in the chemisorption phase. Evidence of a chemisorption phase at oxygen exposures below 50 L has also been obtained for the Al (100) surface. Different charge transfer from Al to O occurs on the two faces, and we suggest the formation of an Al-O complex on the Al(100) with a small charge transfer from Al to O. The transition to the formation of Al 2 O 3 has been characterized by the appearance of the oxide core exciton.},
	number = {8},
	journal = {Physical Review B},
	author = {Bianconi, A. and Bachrach, R. Z. and Flodström, S.},
	month = apr,
	year = {1979},
	keywords = {al, msr, stanford, surface, xanes},
	pages = {3879--3888}
}

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