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Title: Laser-initiated explosive electron emission from flat germanium crystals

Abstract

Flat Sb-doped germanium (100) crystals were investigated in the triode configuration under pulsed tunable laser illumination (pulse duration t{sub laser} = 3.5 ns and photon energy hν = 0.54–5.90 eV) and under DC voltages <10{sup 4} V. Large bunch charges up to ∼1 μC were extracted from the cathodes for laser pulses >1 MW/cm{sup 2} corresponding to a high quantum efficiency up to 3.3% and cathode currents up to 417 A. This laser-induced explosive electron emission (EEE) from Ge was characterized by its voltage-, laser power- and hν-sensitivity. The analysis of the macroscopic surface damage caused by the EEE is included as well. Moreover, we have carried out first direct measurements of electron energy distributions produced during the EEE from the Ge samples. The measured electron spectra hint for electron excitations to the vacuum level of the bulk and emission from the plasma plume with an average kinetic energy of ∼0.8 eV.

Authors:
; ;  [1]
  1. Faculty of Mathematics and Natural Sciences, Physics Department, University of Wuppertal, Wuppertal 42119 (Germany)
Publication Date:
OSTI Identifier:
22597774
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 120; Journal Issue: 4; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CATHODES; CONFIGURATION; CRYSTALS; DOPED MATERIALS; ELECTRIC POTENTIAL; ELECTRON EMISSION; ELECTRON SPECTRA; ELECTRONS; ENERGY SPECTRA; EXCITATION; EXPLOSIVES; GERMANIUM; ILLUMINANCE; KINETIC ENERGY; LASERS; PHOTONS; PLASMA; PULSES; QUANTUM EFFICIENCY; SENSITIVITY

Citation Formats

Porshyn, V., E-mail: porshyn@uni-wuppertal.de, Mingels, S., Lützenkirchen-Hecht, D., and Müller, G. Laser-initiated explosive electron emission from flat germanium crystals. United States: N. p., 2016. Web. doi:10.1063/1.4959800.
Porshyn, V., E-mail: porshyn@uni-wuppertal.de, Mingels, S., Lützenkirchen-Hecht, D., & Müller, G. Laser-initiated explosive electron emission from flat germanium crystals. United States. https://doi.org/10.1063/1.4959800
Porshyn, V., E-mail: porshyn@uni-wuppertal.de, Mingels, S., Lützenkirchen-Hecht, D., and Müller, G. 2016. "Laser-initiated explosive electron emission from flat germanium crystals". United States. https://doi.org/10.1063/1.4959800.
@article{osti_22597774,
title = {Laser-initiated explosive electron emission from flat germanium crystals},
author = {Porshyn, V., E-mail: porshyn@uni-wuppertal.de and Mingels, S. and Lützenkirchen-Hecht, D. and Müller, G.},
abstractNote = {Flat Sb-doped germanium (100) crystals were investigated in the triode configuration under pulsed tunable laser illumination (pulse duration t{sub laser} = 3.5 ns and photon energy hν = 0.54–5.90 eV) and under DC voltages <10{sup 4} V. Large bunch charges up to ∼1 μC were extracted from the cathodes for laser pulses >1 MW/cm{sup 2} corresponding to a high quantum efficiency up to 3.3% and cathode currents up to 417 A. This laser-induced explosive electron emission (EEE) from Ge was characterized by its voltage-, laser power- and hν-sensitivity. The analysis of the macroscopic surface damage caused by the EEE is included as well. Moreover, we have carried out first direct measurements of electron energy distributions produced during the EEE from the Ge samples. The measured electron spectra hint for electron excitations to the vacuum level of the bulk and emission from the plasma plume with an average kinetic energy of ∼0.8 eV.},
doi = {10.1063/1.4959800},
url = {https://www.osti.gov/biblio/22597774}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 4,
volume = 120,
place = {United States},
year = {Thu Jul 28 00:00:00 EDT 2016},
month = {Thu Jul 28 00:00:00 EDT 2016}
}