@misc{
author = "Šišović, Nikola M. and Majstorović, Gordana Lj. and Ivanović, Nikola V. and Konjevic, Nikola",
year = "2014",
abstract = "Glow discharges are successfully used as an excitation source for analytical spectroscopy of metal and alloy
samples [1, 2]. These glow discharge sources (GDS) are usually built on the basis of the Grimm original
design [3] with direct current (dc) and more recently with radio frequency (RF) excitation.
With the growing number of applications of GDSs in optical emission spectroscopy (OES) it became evident
that reliable wavelength tables of glow discharge spectra are needed. A group of authors decided to
overcome this lack of data and began the formidable task of measuring and comparing GD wavelengths and
line intensity data with other available sources of information [4]. One of used instruments was a high
spectral resolution Fourier transform spectrometer (FTS). As a light source a Grimm-type GDS with 4mm
anode hole operated in argon or neon was utilized. A discharge voltage of 720V and discharge current of
20mA are kept constant in all experiments, while the pressure is varied depending on the cathode material
and working gas. All discharge observations are carried out end-on through the anode opening, i.e.
perpendicular to the cathode surface. The lines of several cathode elements are studied and some of them
are used as wavelength standards (Fe I lines for example). A considerable part of this study is devoted to
argon and neon lines, i.e. gases which are used most frequently to operate an analytical GDS. Recently, it
has been noted that some Ar I and Ne I lines have large widths, exceeding 4–5 times the instrumental half-
width, and in addition to line broadening red shifting of lines has also been detected [5].
In order to determine the origin of large widths and shifts detected in [5], Ar I and Ne I line shapes in an
abnormal argon or neon glow discharge were observed along the axis of a cylindrical glow discharge parallel
(side-on) and perpendicular (end-on) to the cathode surface [6]. The side-on spectra show spectral line
shifting and sometimes simultaneous shifting and splitting in the cathode fall region of the glow discharge.
The results of the measured line shift with available data for the dc Stark effect are used for measurement of
electric field strength in the cathode fall region of the glow discharge. The end-on recorded line profiles show
10–40% larger half-widths than the side-on recorded line profiles. This effect is a result of the superposition
of line emission in the cathode fall region under the influence of the dc Stark effect on the line profile from
the negative glow.
The explanation is of importance for the application of new wavelength tables and may be of some value for
characterization of other discharges.",
publisher = "Czech Technical University in Prague, Czech Republic",
journal = "2nd International Glow Discharge Spectroscopy Symposium",
title = "ArI and NeI SPECTRAL LINE SHAPES IN CATHODE FALL REGION OF GRIMM-TYPE GLOW DISCHARGE",
pages = "52",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_6927"
}
