Atomic arrangement on ZrO/W(100) cathode surface - models for LEED intensity vs. voltage analysis

Satoru Kawata; Masayoshi Oka; Taichi Takami; Seigi Mizuno; Hideaki Nakane; Hiroshi Adachi

doi:10.1016/S0169-4332(99)00069-0

Atomic arrangement on ZrO/W(100) cathode surface - models for LEED intensity vs. voltage analysis

Satoru Kawata, Masayoshi Oka, Taichi Takami, Seigi Mizuno, Hideaki Nakane, Hiroshi Adachi

Research output: Contribution to journal › Conference article › peer-review

3 Citations (Scopus)

Abstract

The ZrO/W(100) thermal field emitter has been widely used for cathodes in electron microscopy because this surface shows a remarkably low work function. In spite of its wide application, the reducing mechanism of the work function has not been clearly understood. On the ZrO/W(100) surface, Zr is considered to be located at an outermost position and O is just below it because the Zr-O pair has an electric dipole whose positive side is Zr, and it makes an electric double layer, which is reasonable for work function reducing. For confirmation of the atomic arrangement, low-energy electron diffraction (LEED) intensity vs. voltage (I-V) analysis was done. At stage 1 of LEED I-V analysis, the most simple models were built and calculated. The result showed poor possibility of these models. Several more complex models, which should be considered, are shown in this study.

Original language	English
Pages (from-to)	408-411
Number of pages	4
Journal	Applied Surface Science
Volume	146
Issue number	1
DOIs	https://doi.org/10.1016/S0169-4332(99)00069-0
Publication status	Published - May 1999
Event	Proceedings of the 1998 2nd International Vacuum Electron Sources Conference, IVESC-98 - Tsukuba, Jpn Duration: Jul 7 1998 → Jul 10 1998

All Science Journal Classification (ASJC) codes

Chemistry(all)
Condensed Matter Physics
Physics and Astronomy(all)
Surfaces and Interfaces
Surfaces, Coatings and Films

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10.1016/S0169-4332(99)00069-0

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title = "Atomic arrangement on ZrO/W(100) cathode surface - models for LEED intensity vs. voltage analysis",

abstract = "The ZrO/W(100) thermal field emitter has been widely used for cathodes in electron microscopy because this surface shows a remarkably low work function. In spite of its wide application, the reducing mechanism of the work function has not been clearly understood. On the ZrO/W(100) surface, Zr is considered to be located at an outermost position and O is just below it because the Zr-O pair has an electric dipole whose positive side is Zr, and it makes an electric double layer, which is reasonable for work function reducing. For confirmation of the atomic arrangement, low-energy electron diffraction (LEED) intensity vs. voltage (I-V) analysis was done. At stage 1 of LEED I-V analysis, the most simple models were built and calculated. The result showed poor possibility of these models. Several more complex models, which should be considered, are shown in this study.",

author = "Satoru Kawata and Masayoshi Oka and Taichi Takami and Seigi Mizuno and Hideaki Nakane and Hiroshi Adachi",

year = "1999",

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doi = "10.1016/S0169-4332(99)00069-0",

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journal = "Applied Surface Science",

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TY - JOUR

T1 - Atomic arrangement on ZrO/W(100) cathode surface - models for LEED intensity vs. voltage analysis

AU - Kawata, Satoru

AU - Oka, Masayoshi

AU - Takami, Taichi

AU - Mizuno, Seigi

AU - Nakane, Hideaki

AU - Adachi, Hiroshi

PY - 1999/5

Y1 - 1999/5

N2 - The ZrO/W(100) thermal field emitter has been widely used for cathodes in electron microscopy because this surface shows a remarkably low work function. In spite of its wide application, the reducing mechanism of the work function has not been clearly understood. On the ZrO/W(100) surface, Zr is considered to be located at an outermost position and O is just below it because the Zr-O pair has an electric dipole whose positive side is Zr, and it makes an electric double layer, which is reasonable for work function reducing. For confirmation of the atomic arrangement, low-energy electron diffraction (LEED) intensity vs. voltage (I-V) analysis was done. At stage 1 of LEED I-V analysis, the most simple models were built and calculated. The result showed poor possibility of these models. Several more complex models, which should be considered, are shown in this study.

AB - The ZrO/W(100) thermal field emitter has been widely used for cathodes in electron microscopy because this surface shows a remarkably low work function. In spite of its wide application, the reducing mechanism of the work function has not been clearly understood. On the ZrO/W(100) surface, Zr is considered to be located at an outermost position and O is just below it because the Zr-O pair has an electric dipole whose positive side is Zr, and it makes an electric double layer, which is reasonable for work function reducing. For confirmation of the atomic arrangement, low-energy electron diffraction (LEED) intensity vs. voltage (I-V) analysis was done. At stage 1 of LEED I-V analysis, the most simple models were built and calculated. The result showed poor possibility of these models. Several more complex models, which should be considered, are shown in this study.

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DO - 10.1016/S0169-4332(99)00069-0

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VL - 146

SP - 408

EP - 411

JO - Applied Surface Science

JF - Applied Surface Science

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T2 - Proceedings of the 1998 2nd International Vacuum Electron Sources Conference, IVESC-98

Y2 - 7 July 1998 through 10 July 1998

ER -

Atomic arrangement on ZrO/W(100) cathode surface - models for LEED intensity vs. voltage analysis

Abstract

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