Enhanced sensitivity to oxide surface defects using Augerphotoelectron coincidence spectroscopy

A. K. See; W. K. Siu; R. A. Bartynski; A. Nangia; A. H. Weiss; S. L. Hulbert; X. Wu; C. C. Kao

doi:10.1016/S0039-6028(97)00165-9

Enhanced sensitivity to oxide surface defects using Augerphotoelectron coincidence spectroscopy

A. K. See, W. K. Siu, R. A. Bartynski, A. Nangia, A. H. Weiss, S. L. Hulbert, X. Wu, C. C. Kao

School of Arts and Sciences, New High Energy Theory Center

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

We present Auger-photoelectron coincidence (APECS) spectra of the Ti 3p core level obtained in coincidence with Ti M_2,3VV Auger electrons from the stoichiometric and vacuum annealed TiO₂(110) surfaces. For both surfaces, emission corresponding to reduced oxidation states has approximately an order of magnitude greater relative intensity in the coincidence spectrum as compared with the corresponding ordinary (singles) photoemission spectrum. We associate the excess coincidence signal from the stoichiometric surface with previously undetected residual defects. The origins and implications of the enhanced sensitivity of APECS to defects at oxide surfaces is discussed.

Original language	English (US)
Pages (from-to)	L735-L741
Journal	Surface Science
Volume	383
Issue number	2-3
DOIs	https://doi.org/10.1016/S0039-6028(97)00165-9
State	Published - Jul 10 1997

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

Keywords

Auger ejection
Auger electron spectroscopy
Photoelectron emission
Surface defects
Titanium oxide

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10.1016/S0039-6028(97)00165-9

Cite this

@article{1afdd303f9d649d2a39bc040ceaa45fb,

title = "Enhanced sensitivity to oxide surface defects using Augerphotoelectron coincidence spectroscopy",

abstract = "We present Auger-photoelectron coincidence (APECS) spectra of the Ti 3p core level obtained in coincidence with Ti M2,3VV Auger electrons from the stoichiometric and vacuum annealed TiO2(110) surfaces. For both surfaces, emission corresponding to reduced oxidation states has approximately an order of magnitude greater relative intensity in the coincidence spectrum as compared with the corresponding ordinary (singles) photoemission spectrum. We associate the excess coincidence signal from the stoichiometric surface with previously undetected residual defects. The origins and implications of the enhanced sensitivity of APECS to defects at oxide surfaces is discussed.",

keywords = "Auger ejection, Auger electron spectroscopy, Photoelectron emission, Surface defects, Titanium oxide",

author = "See, {A. K.} and Siu, {W. K.} and Bartynski, {R. A.} and A. Nangia and Weiss, {A. H.} and Hulbert, {S. L.} and X. Wu and Kao, {C. C.}",

note = "Funding Information: We wish to thank G. Nelson for assisting in the data analysis and T. Madey and U. Diebold for helpful suggestions and discussions. This research (RAB, AKS, WKS) was supported by the NSF under grant No. DMR94-11610. Two of us (AHS, AN) acknowledge support from NSF grant No. DMR91002459 and the Welsh Foundation. The NSLS is funded by the U.S. DoE under Contract DE-AC02-76CH00016.",

year = "1997",

month = jul,

day = "10",

doi = "10.1016/S0039-6028(97)00165-9",

language = "English (US)",

volume = "383",

pages = "L735--L741",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier B.V.",

number = "2-3",

}

TY - JOUR

T1 - Enhanced sensitivity to oxide surface defects using Augerphotoelectron coincidence spectroscopy

AU - See, A. K.

AU - Siu, W. K.

AU - Bartynski, R. A.

AU - Nangia, A.

AU - Weiss, A. H.

AU - Hulbert, S. L.

AU - Wu, X.

AU - Kao, C. C.

N1 - Funding Information: We wish to thank G. Nelson for assisting in the data analysis and T. Madey and U. Diebold for helpful suggestions and discussions. This research (RAB, AKS, WKS) was supported by the NSF under grant No. DMR94-11610. Two of us (AHS, AN) acknowledge support from NSF grant No. DMR91002459 and the Welsh Foundation. The NSLS is funded by the U.S. DoE under Contract DE-AC02-76CH00016.

PY - 1997/7/10

Y1 - 1997/7/10

N2 - We present Auger-photoelectron coincidence (APECS) spectra of the Ti 3p core level obtained in coincidence with Ti M2,3VV Auger electrons from the stoichiometric and vacuum annealed TiO2(110) surfaces. For both surfaces, emission corresponding to reduced oxidation states has approximately an order of magnitude greater relative intensity in the coincidence spectrum as compared with the corresponding ordinary (singles) photoemission spectrum. We associate the excess coincidence signal from the stoichiometric surface with previously undetected residual defects. The origins and implications of the enhanced sensitivity of APECS to defects at oxide surfaces is discussed.

AB - We present Auger-photoelectron coincidence (APECS) spectra of the Ti 3p core level obtained in coincidence with Ti M2,3VV Auger electrons from the stoichiometric and vacuum annealed TiO2(110) surfaces. For both surfaces, emission corresponding to reduced oxidation states has approximately an order of magnitude greater relative intensity in the coincidence spectrum as compared with the corresponding ordinary (singles) photoemission spectrum. We associate the excess coincidence signal from the stoichiometric surface with previously undetected residual defects. The origins and implications of the enhanced sensitivity of APECS to defects at oxide surfaces is discussed.

KW - Auger ejection

KW - Auger electron spectroscopy

KW - Photoelectron emission

KW - Surface defects

KW - Titanium oxide

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U2 - 10.1016/S0039-6028(97)00165-9

DO - 10.1016/S0039-6028(97)00165-9

M3 - Article

AN - SCOPUS:0031191906

SN - 0039-6028

VL - 383

SP - L735-L741

JO - Surface Science

JF - Surface Science

IS - 2-3

ER -

Enhanced sensitivity to oxide surface defects using Augerphotoelectron coincidence spectroscopy

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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