Second order isothermal desorption kinetics

Citation
Y. Lilach et al., Second order isothermal desorption kinetics, CATAL LETT, 76(1-2), 2001, pp. 35-39
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
CATALYSIS LETTERS
ISSN journal
1011-372X → ACNP
Volume
76
Issue
1-2
Year of publication
2001
Pages
35 - 39
Database
ISI
SICI code
1011-372X(2001)76:1-2<35:SOIDK>2.0.ZU;2-E
Abstract
A new method is presented to analyze recombinative desorption from surfaces in an isothermal mode. The activation energy for desorption obtained this way is accurate as long as it is coverage independent. Second order recombi native desorption experiments of N-15(2) and D-2 from Ru(001) were used to demonstrate this method. The activation energies were E-a(N-2) = 48 +/- 2 k cal/mol and E-a(D-2) = 22 +/- 1 kcal/mol for coverages below 0.1 and 0.2 of saturation coverage, respectively. Studying N/Ru(001) provides evidence fo r bulk nitrogen atoms that slowly diffuse to the surface leading to isotope scrambling.