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Weiss, Zdeněk, Steers, Edward B. M., Pickering, Juliet C. and Mushtaq, Sohail (2014) Excitation and transition rate diagrams of singly ionized iron in analytical glow discharges in argon, neon and an argon-hydrogen mixture. J. Anal. At. Spectrom., 29 (11). pp. 2078-2090. ISSN 0267-9477
Full text not available from this repository. (Request a copy)Abstract / Description
The emission spectra of iron observed using a Grimm-type glow discharge in argon, argon with 0.3% v/v hydrogen and neon were studied to identify major excitation and ionization processes of iron ions in the plasma. Transition rate diagrams are given for iron ions in those discharges. These are particularly useful for describing situations in which the rate of radiative decay of excited states is comparable to or exceeds the rate of their collisional de-excitation. Relationships between transition rate diagrams and Boltzmann plots are discussed. The following processes were identified to be responsible for excitation of Fe II glow discharge spectra: charge transfer from argon/neon ions to ground state- and metastable iron atoms, Penning excitation of ground state- and metastable iron ions by argon metastables and collisional excitation by electrons of metastable iron ions. No evidence was found that local thermodynamic equilibrium exists for iron ions in a glow discharge plasma in any interval of excitation energies. Open questions remain concerning charge transfer excitation of iron, in particular about the range of energies in which the Fe II levels can be directly populated by charge transfer and about the conservation of spin in such reactions.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | glow discharge spectroscopy |
| Subjects: | 500 Natural Sciences and Mathematics > 540 Chemistry & allied sciences |
| Department: | School of Human Sciences |
| Depositing User: | Bal Virdee |
| Date Deposited: | 22 Oct 2015 17:49 |
| Last Modified: | 22 Jun 2020 15:08 |
| URI: | https://repository.londonmet.ac.uk/id/eprint/812 |
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