Enhancement of analyte atomic lines with excitation energies of about 5 eV in the presence of molecular gases in analytical glow discharges

2014 ◽  
Vol 29 (11) ◽  
pp. 2022-2026 ◽  
Author(s):  
Sohail Mushtaq ◽  
Edward B. M. Steers ◽  
Juliet C. Pickering ◽  
Petr Šmid
Keyword(s):  
Excitation Energies ◽  
Molecular Gases ◽  
Glow Discharges ◽  
Atomic Lines

Small amounts of hydrogen or oxygen in either argon or neon plasmas cause previously unexplained enhanced excitation of various analyte atomic lines with upper energies close to 5 eV.

scholarly journals The effects of traces of molecular gases (H2, N2& O2) in glow discharges in noble gases

2008 ◽  
Vol 133 ◽  
pp. 012020 ◽  
Author(s):  
E B M Steers ◽  
P Šmid ◽  
V Hoffmann ◽  
Z Weiss
Keyword(s):  
Noble Gases ◽  
Molecular Gases ◽  
Glow Discharges

A study of the light emitted from the initial stages of a spark discharge

1964 ◽  
Vol 278 (1373) ◽  
pp. 168-187 ◽  
Keyword(s):  
Threshold Voltage ◽  
High Speed ◽  
Homogeneous Field ◽  
Electrode Gap ◽  
Diffuse Discharge ◽  
Glow Discharges ◽  
Field Electrode ◽  
Atomic Lines ◽  
Chamber Studies ◽  
Spark Channel

Measurements have been made, by means of submicrosecond impulses, on the threshold voltage at which the first visible discharge occurs in a homogeneous field electrode gap. Various gases have been used at different values of gap and gas pressure. In most gases there is some indication of a change in the form of the initial discharge as the gap is varied. At a certain value of electrode gap, depending upon the impulse length and gap pressure, there is a change in slope of the threshold voltage-gap curve. Above this point the discharges are generally filamentary whereas at smaller gaps they are broad and diffuse. In air, nitrogen and oxygen the filamentary discharges are often constricted at a point in the gap. The position of this constriction depends on the impulse and gap length. It is suggested that the filamentary discharges correspond to a streamer type of discharge and are similar to the ones observed in the previous cloud chamber studies. The broad diffuse discharge which occurs at smaller gaps is probably the Townsend type of discharge In argon and hydrogen the evidence for the existence of two breakdown mechanisms is not very strong. High-speed streak photography has revealed that the filamentary glow discharges in air appear to grow towards the constriction. A spark channel then begins to form at the constriction and grows towards the electrodes. Spectroscopic examination of the various types of discharge shows the prominent second positive N 2 bands for discharges in air and nitrogen but with a continuum, N + 2 bands and atomic lines in the constriction. An estimate of the peak electron energy has been made for various discharges in air and nitrogen and found to be about 14eV.

DC normal glow discharges in atmospheric pressure atomic and molecular gases

2008 ◽  
Vol 17 (2) ◽  
pp. 025013 ◽  
Author(s):  
David Staack ◽  
Bakhtier Farouk ◽  
Alexander Gutsol ◽  
Alexander Fridman
Keyword(s):  
Atmospheric Pressure ◽  
Molecular Gases ◽  
Glow Discharges

The effect of hydrogen and nitrogen on emission spectra of iron and titanium atomic lines in analytical glow discharges

2008 ◽  
Vol 23 (9) ◽  
pp. 1223 ◽  
Author(s):  
Petr Šmíd ◽  
Edward Steers ◽  
Zdeněk Weiss ◽  
Juliet Pickering ◽  
Volker Hoffmann
Keyword(s):  
Emission Spectra ◽  
Glow Discharges ◽  
Atomic Lines

Plasma non-equilibrium of the DC normal glow discharges in atmospheric pressure atomic and molecular gases

2012 ◽  
Vol 66 (10) ◽  
Author(s):  
V.I. Arkhipenko ◽  
A.A. Kirillov ◽  
Y.A. Safronau ◽  
L.V. Simonchik ◽  
S.M. Zgirouski
Keyword(s):  
Atmospheric Pressure ◽  
Molecular Gases ◽  
Glow Discharges ◽  
Non Equilibrium

STARK SHIFT AND BROADENING OF ATOMIC LINES AS OBSERVED ON OPTOGALVANIC SPECTRA OF NOBLE GASES

1983 ◽  
Vol 44 (C7) ◽  
pp. C7-497-C7-504 ◽  
Author(s):  
T. Nakajima ◽  
N. Uchitomi ◽  
Y. Adachi ◽  
S. Maeda ◽  
C. Hirose
Keyword(s):  
Noble Gases ◽  
Stark Shift ◽  
Atomic Lines

Energy Levels and Electromagnetic Transition of 90-94mo Nuclei Using Ibm-1

2020 ◽  
pp. 149-152
Keyword(s):  
Experimental Data ◽  
Transition Probability ◽  
Energy Levels ◽  
Dynamical Symmetry ◽  
Interacting Boson Model ◽  
Excitation Energies ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Energy States ◽  
Good Agreement

The energy states for the J , b , ɤ bands and electromagnetic transitions B (E2) values for even – even molybdenum 90 – 94 Mo nuclei are calculated in the present work of "the interacting boson model (IBM-1)" . The parameters of the equation of IBM-1 Hamiltonian are determined which yield the best excellent suit the experimental energy states . The positive parity of energy states are obtained by using IBS1. for program for even 90 – 94 Mo isotopes with bosons number 5 , 4 and 5 respectively. The" reduced transition probability B(E2)" of these neuclei are calculated and compared with the experimental data . The ratio of the excitation energies of the 41+ to 21+ states ( R4/2) are also calculated . The calculated and experimental (R4/2) values showed that the 90 – 94 Mo nuclei have the vibrational dynamical symmetry U(5). Good agreement was found from comparison between the calculated energy states and electric quadruple probabilities B(E2) transition of the 90–94Mo isotopes with the experimental data .

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