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Title: Ultrafast laser-collision-induced fluorescence in atmospheric pressure plasma

The implementation and demonstration of laser-collision-induced fluorescence (LCIF) generated in atmospheric pressure helium environments is presented in this communication. As collision times are observed to be fast (~10 ns), ultrashort pulse laser excitation (<100 fs) of the 2 3S to 3 3P (388.9 nm) is utilized to initiate the LCIF process. Both neutral-induced and electron-induced components of the LCIF are observed in the helium afterglow plasma as the reduced electric field (E/N) is tuned from <0.1 Td to over 5 Td. Under the discharge conditions presented in this study (640 Torr He), the lower limit of electron density detection is ~10 12 e cm -3. Lastly, the spatial profiles of the 2 3S helium metastable and electrons are presented as functions of E/N to demonstrate the spatial resolving capabilities of the LCIF method.
Authors:
 [1] ;  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Report Number(s):
SAND-2017-0510J
Journal ID: ISSN 0022-3727; 650506
Grant/Contract Number:
AC04-94AL85000; SC0001939; AC04-94SL85000
Type:
Published Article
Journal Name:
Journal of Physics. D, Applied Physics
Additional Journal Information:
Journal Volume: 50; Journal Issue: 14; Journal ID: ISSN 0022-3727
Publisher:
IOP Publishing
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; atmospheric pressure plasma; diagnostics; laser-collision-induced fluorescence; ultrafast laser; laser-induced fluorescence; helium
OSTI Identifier:
1345846
Alternate Identifier(s):
OSTI ID: 1361648