On the extremum behaviour of the heat capacity of species with a low-lying excited electronic state and of isomeric mixtures: a solvable model

✍ Scribed by Zdeněk Slanina

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 452 KB
• Volume: 130
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(86)80482-1

✦ Synopsis

Within a simple two-state model it is shown that there exists a pronounced maximum in the temperature dependence of the contribution to Cz from the low-lying first excited electronic state; the same reasoning also applies to two-isomer mixtures. The position of the maximum is, for equal degeneracy factors of both states, rigorously determined within the model; its height is 3.65 J K-' mol-' and does not depend on the nature of the system. The general results are supplemented by examples on systems of current interest (NO(g); Al(g); F(g); Si?H,(g)).