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Title: Detection of significant differences between absorption spectra of neutral helium and low temperature photoionized helium plasmas

Abstract

In this work, spectral investigations of photoionized He plasmas were performed. The photoionized plasmas were created by irradiation of helium stream, with intense pulses from laser-plasma extreme ultraviolet (EUV) source. The EUV source was based on a double-stream Xe/Ne gas-puff target irradiated with 10 ns/10 J Nd:YAG laser pulses. The most intense emission from the source spanned a relatively narrow spectral region below 20 nm, however, spectrally integrated intensity at longer wavelengths was also significant. The EUV radiation was focused onto a gas stream, injected into a vacuum chamber synchronously with the EUV pulse. The long-wavelength part of the EUV radiation was used for backlighting of the photoionized plasmas to obtain absorption spectra. Both emission and absorption spectra in the EUV range were investigated. Significant differences between absorption spectra acquired for neutral helium and low temperature photoionized plasmas were demonstrated for the first time. Strong increase of intensities and spectral widths of absorption lines, together with a red shift of the K-edge, was shown.

Authors:
; ; ; ; ;  [1]
  1. Institute of Optoelectronics, Military University of Technology, Kaliskiego 2, 00-908 Warsaw (Poland)
Publication Date:
OSTI Identifier:
22218453
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 20; Journal Issue: 11; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 74 ATOMIC AND MOLECULAR PHYSICS; ABSORPTION SPECTRA; BEAM-PLASMA SYSTEMS; EXTREME ULTRAVIOLET RADIATION; HELIUM; IRRADIATION; LASER RADIATION; NEODYMIUM LASERS; PHOTOIONIZATION; PHOTON-ATOM COLLISIONS; PLASMA DIAGNOSTICS; PLASMA PRODUCTION; RED SHIFT; XENON COMPOUNDS

Citation Formats

Bartnik, A., Wachulak, P., Fiedorowicz, H., Fok, T., Jarocki, R., and Szczurek, M. Detection of significant differences between absorption spectra of neutral helium and low temperature photoionized helium plasmas. United States: N. p., 2013. Web. doi:10.1063/1.4831975.
Bartnik, A., Wachulak, P., Fiedorowicz, H., Fok, T., Jarocki, R., & Szczurek, M. Detection of significant differences between absorption spectra of neutral helium and low temperature photoionized helium plasmas. United States. https://doi.org/10.1063/1.4831975
Bartnik, A., Wachulak, P., Fiedorowicz, H., Fok, T., Jarocki, R., and Szczurek, M. 2013. "Detection of significant differences between absorption spectra of neutral helium and low temperature photoionized helium plasmas". United States. https://doi.org/10.1063/1.4831975.
@article{osti_22218453,
title = {Detection of significant differences between absorption spectra of neutral helium and low temperature photoionized helium plasmas},
author = {Bartnik, A. and Wachulak, P. and Fiedorowicz, H. and Fok, T. and Jarocki, R. and Szczurek, M.},
abstractNote = {In this work, spectral investigations of photoionized He plasmas were performed. The photoionized plasmas were created by irradiation of helium stream, with intense pulses from laser-plasma extreme ultraviolet (EUV) source. The EUV source was based on a double-stream Xe/Ne gas-puff target irradiated with 10 ns/10 J Nd:YAG laser pulses. The most intense emission from the source spanned a relatively narrow spectral region below 20 nm, however, spectrally integrated intensity at longer wavelengths was also significant. The EUV radiation was focused onto a gas stream, injected into a vacuum chamber synchronously with the EUV pulse. The long-wavelength part of the EUV radiation was used for backlighting of the photoionized plasmas to obtain absorption spectra. Both emission and absorption spectra in the EUV range were investigated. Significant differences between absorption spectra acquired for neutral helium and low temperature photoionized plasmas were demonstrated for the first time. Strong increase of intensities and spectral widths of absorption lines, together with a red shift of the K-edge, was shown.},
doi = {10.1063/1.4831975},
url = {https://www.osti.gov/biblio/22218453}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 11,
volume = 20,
place = {United States},
year = {Fri Nov 15 00:00:00 EST 2013},
month = {Fri Nov 15 00:00:00 EST 2013}
}