Photoelectron Emission Studies in CsBr at 257 nm

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CsBr/Cr photocathodes were found [1,2] to meet the requirements of a multi-electron beam lithography system operating with a light energy of 4.8 eV (257nm). The fact that photoemission was observed with a light energy below the reported 7.3 eV band gap for CsBr was not understood. This paper presents experimental results on the presence of intra-band gap absorption sites (IBAS) in CsBr thin film photo electron emitters, and presents a model based on IBAS to explain the observed photoelectron emission behavior at energies below band gap. A fluorescence band centered at 330 nm with a FWHM of about 0.34 eV ... continued below

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18 pages

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Maldonado, Juan R.; Liu, Zhi; Sun, Yun; Pianetta, Piero A.; Pease, Fabian W. & /Stanford U., Elect. Eng. Dept. /SLAC, SSRL September 28, 2006.

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CsBr/Cr photocathodes were found [1,2] to meet the requirements of a multi-electron beam lithography system operating with a light energy of 4.8 eV (257nm). The fact that photoemission was observed with a light energy below the reported 7.3 eV band gap for CsBr was not understood. This paper presents experimental results on the presence of intra-band gap absorption sites (IBAS) in CsBr thin film photo electron emitters, and presents a model based on IBAS to explain the observed photoelectron emission behavior at energies below band gap. A fluorescence band centered at 330 nm with a FWHM of about 0.34 eV was observed in CsBr/Cr samples under 257 nm laser illumination which can be attributed to IBAS and agrees well with previously obtained synchrotron photoelectron spectra[1] from the valence band of CsBr films.

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18 pages

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  • Journal Name: Submitted to Journal of Vaccum Science and Technology B; Conference: Presented at 51st International Conference on Electron, Ion, and Photon Beams and Nanolithography, Denver, Colorado, 29 May - 1 Jun 2007

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  • Report No.: SLAC-PUB-12109
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 892595
  • Archival Resource Key: ark:/67531/metadc881913

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  • September 28, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 30, 2016, 4:42 p.m.

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Maldonado, Juan R.; Liu, Zhi; Sun, Yun; Pianetta, Piero A.; Pease, Fabian W. & /Stanford U., Elect. Eng. Dept. /SLAC, SSRL. Photoelectron Emission Studies in CsBr at 257 nm, article, September 28, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc881913/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.