TITLE:
Spectroscopic measurement of Stark broadening parameter of the 636.2 nm Zn I-line
AUTHORS:
Ashraf M. El Sherbini, Abdel-Nasser Aboulfotouh, Farid Rashid, Sami H. Allam, Ahmed M. Al-Kaoud, Ashraf El Dakrouri, Tharwat M. El Sherbini
KEYWORDS:
Stark Broadening Parameter; LIBS; OES; ZnO; Zinc Lines
JOURNAL NAME:
Natural Science,
Vol.5 No.4,
April
25,
2013
ABSTRACT:
In
this article we will present an attempt to measure the Stark broadening
parameter of the Zn I-line at 636.23 nm utilizing the optical emission
spectroscopy (OES) technique, taking into consideration the possibility of
existence of self absorption. This method is standing on comparison of the
Lorentzian FWHM and spectral line intensity of the unknown Stark broadening
parameter line (Zn I-636.23 nm—in our case) to a well
known Stark parameter line (e.g. Zn I-lines at 472.2, 481 and 468 nm) at a
reference electron density of 2.7 × 1017 cm-3 and temperature of 1 eV. We have utilized the
emission spectral data acquired from well diagnosed plasma produced by the
interaction of Nd: YAG laser at wavelength of 1064 nm with ZnO nanomaterial
target in open air. The results indicates that the Stark broadening of the Zn
I-line at 636.23 nm is centered at 5.06 ± 0.03 ? with a 25% uncertainty at the given reference plasma
parameters. The knowledge of the Stark broadening parameter of the 636.23 nm
line may be important in the diagnostics of the laser plasma experiments especially
in the absence of the Hα-line.