Systematics of evaporation

Autor: C. E. Klots
Rok vydání: 1991
Předmět:
Zdroj: Zeitschrift f�r Physik D Atoms, Molecules and Clusters. 20:105-109
ISSN: 1434-6079
0178-7683
DOI: 10.1007/bf01543949
Popis: Beginning with rather basic principles, general relations are obtained for evaporative rate constants. These are established both as a function of energy and of temperature. In parallel with this, expressions are developed for the kinetic energy distribution of the separating species. Explicit evaluation of the rate constants in the case of “chemical” evaporation from an entity containingn monomeric units yields as a typical result $$k(T)(s^{ - 1} ) = 3 \cdot 10^{13} n^{{2 \mathord{\left/ {\vphantom {2 3}} \right. \kern-\nulldelimiterspace} 3}} \exp [6/n^{{1 \mathord{\left/ {\vphantom {1 3}} \right. \kern-\nulldelimiterspace} 3}} ]\exp ( - \Delta E_a (n)/k_B T)$$ Experimental evidence in support of this relation is cited. Applications to thermionic emission are also noted.
Databáze: OpenAIRE
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