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Title: Emission dynamics of an expanding ultrafast-laser produced Zn plasma under different ambient pressures

We report time and space resolved spectral measurements of neutral Zn emission from an ultrafast laser produced plasma, generated by the irradiation of a Zn target with laser pulses of 100 femtoseconds duration, carried out in a broad ambient pressure range of 0.05 to 100 Torr. The measurement is done for three different axial positions in the expanding plume. The spectra are rich in neutral Zn (Zn I) emissions at 334.5 nm, 468 nm, 472 nm, 481 nm, and 636 nm, respectively, depicting the characteristic triplet structure of Zn. Fast as well as slow peaks are observed in the time of flight data of 481 nm emission, which arise from recombination and atomic contributions, respectively, occurring at different time scales. Average speeds of the fast atomic species do not change appreciably with ambient pressure. The plasma parameters (electron temperature and number density) are evaluated from the measured optical emission spectra. The rates of ionization and recombination can be enhanced by a double-pulse excitation configuration in which optical energy is coupled to the ultrafast plasma through a delayed laser pulse.
Authors:
;  [1]
  1. Raman Research Institute, C.V. Raman Avenue, Sadashivanagar, Bangalore 560080 (India)
Publication Date:
OSTI Identifier:
22218110
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 9; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTRON TEMPERATURE; EMISSION; EMISSION SPECTRA; EXCITATION; ION TEMPERATURE; IONS; IRRADIATION; LASER-PRODUCED PLASMA; LASERS; PEAKS; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA PRODUCTION; PULSES; RECOMBINATION; TIME-OF-FLIGHT METHOD; TRIPLETS; VELOCITY