The photographic surface is the pivotal carrier of information – be it the mediated image or material indications about the object. It is presented here as the entrance into the study of... Show moreThe photographic surface is the pivotal carrier of information – be it the mediated image or material indications about the object. It is presented here as the entrance into the study of photographic materiality that unfolds in a profound scanning of a photograph’s multi-layered dimensionality and of all the interactions that (can) take place in its lifetime – ranging from human to molecular. The chosen case studies are photoworks (hybrid photographic works of art) that are partially overpainted and show (first) signs of degrading photographic material. The different (material) properties of the two interacting media with their distinct surfaces pose challenging questions on a representational, chemical, conservational as well as a theoretical level. The key concern is: How does the photographic surface act in hybrid photoworks as interface between substances and their surrounding space? By panning back and forth between material, technical, and theoretical studies and the case studies – Tacita Dean’s (*1965) Crowhurst II (2007), and two photoworks by Ger van Elk (1941-2014): Dutch Grey (1983/84) and Russian Diplomacy’s (1974) – I follow the methodological path of a multi-angled analysis of photoworks in order to respond to their hybrid nature and to think with their materiality and subject matter. The result is an in-depth theoretical investigation of the photographic surface as interface between substances and spaces within photoworks in particular, and ontologically in any chemically created photograph. It ties together philosophical, esthetical, technical and ethical point of views and therewith creates a deep understanding of photographic materiality at the verge of digital dominance. Show less
The study of gas-surface interaction dynamics is important both for the fundamental knowledge it provides and also to aid the development of applications involving processes such as sputtering,... Show moreThe study of gas-surface interaction dynamics is important both for the fundamental knowledge it provides and also to aid the development of applications involving processes such as sputtering, plasma etching and heterogeneous catalysis. Elementary steps in the interactions, such as chemical reactions, adsorption and scattering are prototypical of more complex processes and better understanding of them deepens our knowledge of such processes. In addition, experimental measurements of specific interactions can be used to validate advanced computer models. Hence the experiments in this thesis have been carried out under well-defined condition, namely in ultrahigh vacuum and using high-purity single-crystal samples. The thesis is primarily focussed on understanding the interaction of hyperthermal Ar and N (~4-6 eV) with Ru(0001) and Ag(111) via scattering studies. Ar is very inert and its interaction with surfaces is primarily repulsive in nature, while N atoms probe the surface chemisorption well. From the study of Ar scattering dynamics, surface properties have been probed. From N scattering studies, chemisorption dynamics have been investigated. It is found that the electronic state of the incident particle may play an important role in the gas-surface interaction. Separately, the influence of pre-adsorbed CO on Ru(0001) on D2 dissociation have been unravelled. Show less