Photodissociation and photodesorption of O2 adsorbed on Pd(111)

Autor:	Eckart Hasselbrink, H. Hirayama, A. de Meijere, F. Weik, Martin Wolf, Gerhard Ertl
Rok vydání:	1992
Předmět:	Chemistry Photodissociation Chemie Oxygene chemistry.chemical_element Surfaces and Interfaces Photon energy Condensed Matter Physics Photochemistry Oxygen Surfaces Coatings and Films Adsorption Desorption Materials Chemistry Atomic oxygen computer Palladium computer.programming_language
Zdroj:	Surface Science. :235-246
ISSN:	0039-6028
DOI:	10.1016/0039-6028(92)91256-b
Popis:	The dynamics of the UV-photochemistry of molecularly adsorbed oxygen on Pd(111) has been studied using pulsed laser light between 3.9 and 6.4 eV photon energy. Photodissociation to form atomic surface oxygen and photodesorption of O2 are the primary processes. The latter is characterized by a translational energy of about 800 K indicating non-thermal desorption. Since the photolytically formed atomic oxygen competes with the molecular adsorbate for binding sites some of the latter is displaced. This manifests itself in a conversion process between adsorbate states and in a desorption channel with a translational energy of 120 K indicating accommodation to the surface temperature. The cross sections for all processes rise exponentially from 3.9 to 6.4 eV by a factor of 38.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c5bee206340909766f9e6789fb2bbc49 https://doi.org/10.1016/0039-6028(92)91256-b Zobrazit plný text záznamu