Transition rate diagrams - a new approach to the study of selective excitation processes: The spectrum of manganese in a Grimm-type glow discharge

Weiss, Zdeněk and Steers, Edward B. M. and Pickering, Juliet C. and Mushtaq, Sohail (2014) Transition rate diagrams - a new approach to the study of selective excitation processes: The spectrum of manganese in a Grimm-type glow discharge. Spectrochimica Acta Part B: Atomic Spectroscopy, 92. pp. 70-83. ISSN 0584-8547

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Official URL: http://dx.doi.org/10.1016/j.sab.2013.12.006

Abstract

The emission spectra of manganese observed using a Grimm-type glow discharge in pure argon, argon with 0.3% v/v hydrogen and pure neon were studied in order to identify major excitation and ionization processes of manganese in the plasma. A new procedure is proposed, in which each observed emission line is associated with the corresponding transition between different states of the Mn atom or Mn ion, and, by considering all the observed transitions from and into a specific state, a measure of the total rate is determined at which this state is radiatively populated and depopulated. These resulting population/depopulation rates are then plotted as function of level energy. Such plots, called here “transition rate diagrams”, show the role of individual states in the formation of the observed spectrum and can be used to identify possible selective excitation processes. Also, cascade excitation by radiative decay of higher excited states can be conveniently evaluated in this way. A detailed description of the observed Mn I and Mn II spectra is given for Ar, Ar–H2 and Ne plasmas and relevant excitation/ionization mechanisms are discussed. Matrix effects in analysis of manganese by glow discharge spectroscopy are discussed. A list of important Mn I and Mn II lines excited in the glow discharge plasma is given.

Item Type: Article
Uncontrolled Keywords: charged particles, electric discharges, elements, energy levels, energy-level transitions, ions, metals, nonmetals, spectra, spectroscopy, transition elements, emission, emission spectra, emission spectroscopy, excitation, excited states, glow discharges, hydrogen, ionization, manganese, manganese ions, plasma
Subjects: 500 Natural Sciences and Mathemetics > 520 Astronomy & allied sciences
Department: School of Human Sciences
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Depositing User: Bal Virdee
Date Deposited: 22 Oct 2015 18:29
Last Modified: 22 Oct 2015 18:29
URI: http://repository.londonmet.ac.uk/id/eprint/816

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