Thermal and Photon Driven Reactions of NO and H2O Adsorbed on Graphite
Licentiatavhandling, 2010

The topic of this thesis is the interaction of water (H2O) and nitric oxide (NO) with the graphite (C(0001)) surface. Specifically the effects of coadsorbing metals (Na, Ag) and subjecting the adsorption systems to thermal and photon activation were studied. When coadsorbing sodium and water a critical coverage was found, θc, above which dissociative adsorption took place. For coverages below θc the adsorption was molecular and resulted in clustering of the molecules around the Na. The reaction products from the NO/Na/graphite system were shown to depend on the ratio between adsorbed NO and Na, with three distinct coverage ratio regimes. When water was added to the system small amounts of ammonia were formed, in addition to the reaction products seen without water present in the system. NO was found to photodesorb from graphite upon illumination with 355 nm light by a substrate-mediated mechanism. When silver clusters were added to the surface we found a clear dependence of the photoyield on the size and shape of the clusters.

Water

Graphite

Silver Clusters

Sodium

Photodesorption

Nitric Oxide

Particle Plasmons

Fasrummet, Fysikgränd 3, CHALMERS TEKNISKA HÖGSKOLA
Opponent: Professor Janusz Kanski, Fasta Tillståndets Fysik, Institutionen för Teknisk Fysik, CHALMERS TEKNISKA HÖGSKOLA

Författare

Kristina Wettergren

Chalmers, Teknisk fysik, Kemisk fysik

Photodesorption of NO from graphite ( 0 0 0 1 ) surface mediated by silver clusters

Surface Science,; Vol. 593(2005)p. 235-241

Artikel i vetenskaplig tidskrift

Co-adsorption and reactions of Na and H2O on graphite

Applied Surface Science,; Vol. 235(2004)p. 91-96

Artikel i vetenskaplig tidskrift

The interactions of Na, NO, and H2O on the graphite (0001) surface

Journal of Chemical Physics,; Vol. 119(2003)p. 6753-6767

Artikel i vetenskaplig tidskrift

Ämneskategorier

Atom- och molekylfysik och optik

Den kondenserade materiens fysik

Fasrummet, Fysikgränd 3, CHALMERS TEKNISKA HÖGSKOLA

Opponent: Professor Janusz Kanski, Fasta Tillståndets Fysik, Institutionen för Teknisk Fysik, CHALMERS TEKNISKA HÖGSKOLA