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Zeitschrift für Naturforschung A

A Journal of Physical Sciences

Editor-in-Chief: Holthaus, Martin

Editorial Board: Fetecau, Corina / Kiefer, Claus


IMPACT FACTOR 2016: 1.432

CiteScore 2017: 1.30

SCImago Journal Rank (SJR) 2017: 0.403
Source Normalized Impact per Paper (SNIP) 2017: 0.632

Online
ISSN
1865-7109
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Volume 31, Issue 10

Issues

Ermittlung der Dissoziationsenergie von AlO über die Normtemperaturmethode

P. Frank / L. Krauss
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/zna-1976-1010

Abstract

An Al vapour cloud (~1 μg) is generated between Al electrodes of a 10 kV transient spark (1 μs duration) in an environmental atmosphere of pure oxygen. During the cooling-down period of the so formed Al/O-plasma, the reaction Al + O + M -> AlO + M is observed. It can be shown that the conditions within the limited reacting gas volume may be considered as quasi-stationary and hence the laws of chemical equilibrium for computing number densities of atoms and molecules may be applied. The emissivity εrel (radiation per unit volume) of the AlO B2 Σ → 2Σ system at 4842 Å and the gas temperature of the decaying plasma are recorded in terms of a laboratory time scale. The maximum of εrel (normalized maximum) may be correlated to the dissociation energy of AlO, yielding 5.17 ±0.3 eV. Effects of dilution, the pressure influence as well as the vibrational relaxation of AlO during its formation are considered and included in the calculations.

About the article

Received: 1976-07-03

Published Online: 2014-06-02

Published in Print: 1976-10-01


Citation Information: Zeitschrift für Naturforschung A, Volume 31, Issue 10, Pages 1193–1202, ISSN (Online) 1865-7109, ISSN (Print) 0932-0784, DOI: https://doi.org/10.1515/zna-1976-1010.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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