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Title: Interaction of Wide-Band-Gap Single Crystals with 248-nm Excimer Laser Irradiation: X. Laser-Induced Near-Surface Absorption in Single-Crystal NaCl

Abstract

Ultraviolet laser-induced desorption of neutral atoms and molecules from nominally transparent, ionic materials can yield particle velocities consistent with surface temperatures of a few thousand Kelvin, even in the absence of visible surface damage. The origin of the laser required for this surface heating has been often overlooked. In this work, we report simultaneous neutral emission and laser transmission measurements on single crystal NaCl exposed to 248-nm excimer laser radiation. As much as 20% of the incident radiation at 248 nm must be absorbed in the near surface region to account for the observed particle velocities. We show that the laser absorption grows from low values over several pulses and saturates at values sufficient to account for the surface temperatures required to explain the observed particle velocity distributions. The growth of absorption in these early pulses is accompanied by a corresponding increase in the emission intensities. Diffuse reflectance spectra acquired after exposure suggest that near surface V-type centers are responsible for most of the absorption at 248 nm in single crystal NaCl.

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab., Richland, WA (US), Environmental Molecular Sciences Laboratory (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15016315
Report Number(s):
PNNL-SA-43898
Journal ID: ISSN 0021-8979; JAPIAU; 1365a; KC0301020; TRN: US200513%%35
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 97; Journal Issue: 4; Other Information: Article no. 043501; PBD: 15 Feb 2005; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; DESORPTION; EXCIMER LASERS; HEATING; IRRADIATION; MONOCRYSTALS; LASER RADIATION; SODIUM CHLORIDES; ENVIRONMENTAL MOLECULAR SCIENCES LABORATORY

Citation Formats

Nwe, K H, Langford, Stephen C, Dickinson, J T, and Hess, Wayne P. Interaction of Wide-Band-Gap Single Crystals with 248-nm Excimer Laser Irradiation: X. Laser-Induced Near-Surface Absorption in Single-Crystal NaCl. United States: N. p., 2005. Web. doi:10.1063/1.1847696.
Nwe, K H, Langford, Stephen C, Dickinson, J T, & Hess, Wayne P. Interaction of Wide-Band-Gap Single Crystals with 248-nm Excimer Laser Irradiation: X. Laser-Induced Near-Surface Absorption in Single-Crystal NaCl. United States. https://doi.org/10.1063/1.1847696
Nwe, K H, Langford, Stephen C, Dickinson, J T, and Hess, Wayne P. 2005. "Interaction of Wide-Band-Gap Single Crystals with 248-nm Excimer Laser Irradiation: X. Laser-Induced Near-Surface Absorption in Single-Crystal NaCl". United States. https://doi.org/10.1063/1.1847696.
@article{osti_15016315,
title = {Interaction of Wide-Band-Gap Single Crystals with 248-nm Excimer Laser Irradiation: X. Laser-Induced Near-Surface Absorption in Single-Crystal NaCl},
author = {Nwe, K H and Langford, Stephen C and Dickinson, J T and Hess, Wayne P},
abstractNote = {Ultraviolet laser-induced desorption of neutral atoms and molecules from nominally transparent, ionic materials can yield particle velocities consistent with surface temperatures of a few thousand Kelvin, even in the absence of visible surface damage. The origin of the laser required for this surface heating has been often overlooked. In this work, we report simultaneous neutral emission and laser transmission measurements on single crystal NaCl exposed to 248-nm excimer laser radiation. As much as 20% of the incident radiation at 248 nm must be absorbed in the near surface region to account for the observed particle velocities. We show that the laser absorption grows from low values over several pulses and saturates at values sufficient to account for the surface temperatures required to explain the observed particle velocity distributions. The growth of absorption in these early pulses is accompanied by a corresponding increase in the emission intensities. Diffuse reflectance spectra acquired after exposure suggest that near surface V-type centers are responsible for most of the absorption at 248 nm in single crystal NaCl.},
doi = {10.1063/1.1847696},
url = {https://www.osti.gov/biblio/15016315}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 4,
volume = 97,
place = {United States},
year = {Tue Feb 15 00:00:00 EST 2005},
month = {Tue Feb 15 00:00:00 EST 2005}
}