|
Showing 1 - 4 of
4 matches in All Departments
This volume contains the invited papers and selected contributed
papers presented at the biennial International Symposium on
ELECTRON COLLISIONS WITH MOLECULES, CLUSTERS AND SURF ACES held at
Royal Holloway, University of London from 29th to 30th July, 1993.
This Symposium was a Satellite Meeting of the XVIII International
Conference on the Physics of Electronic and Atomic Collisions
(ICPEAC) and follows a 16 year tradition of Satellite Conferences
in related areas of collisions held in association with previous
ICPEAC's. In the past each of these electron -molecule symposia
covered the broad field of electron-molecule scattering at rather
low energies, but also included hot topics. This time as well as
covering the whole field, well defined electron collisions with
clusters and with particles in the complex potential of a surface
were emphasized. Not many details are known about such collisions,
although they become more and more important in surface
characterisation, plasma-wall interactions, electron induced
desorption and reorganisation of adsorbed particles. Recently, much
work, theoretical and experimental, has been devoted to electron
collisions with rather large carbon, silicon and halogen containing
molecules. These problems are of relevance in plasma assisted thin
film formation and etching of surfaces and can now be approached
with advanced theoretical methods and experimental equipment.
An (e,2e) experiment is the measurement of an electron impact
ionization process where both the exiting electrons are detected in
coincidence. Such measurements are almost at the limit of what can
be known, in quantum mechanical terms, and its description presents
a substantial theoretical challenge. There are at least two very
good reasons for studying (e,2e) and related processes. In the
first place we are now only beginning to understand the dynamics of
the collision process. The range and sophistication of present
experiments allow us to identify kinematic regimes where delicate
and subtle effects can be observed, stretching current theories to
their limit. Secondly, the multiple coincident technique offers us
the possibility of an analytical tool that could be used to probe
the structure of the target, be it atom, molecule, thin film or
surface. Measurements are now being performed at threshold on H, on
the inner shell levels of Au and Ag using projectiles at
relativistic energies, with spin-polarized electrons on Li, on a
myriad of molecules in symmetric, noncoplanar kinematics, and on He
in a multitude of different geometries. The technique has recently
been extended to excitation ionization (e,3e) and (gamma,2e)
experiments. Major theoretical advances have also been made, but
much still remains to be done. This volume contains the invited
papers that were presented at the Workshop on (e,2e) and related
processes which took place in September/October 1992 in Cambridge,
UK. The three major review papers which it contains together form
an excellent introduction to this new and rapidly expanding area of
physics and set the scene for the wide range of research
contributions, both experimental and theoretical, from the leading
scientists in the field.
This volume contains the invited papers and selected contributed
papers presented at the biennial International Symposium on
ELECTRON COLLISIONS WITH MOLECULES, CLUSTERS AND SURF ACES held at
Royal Holloway, University of London from 29th to 30th July, 1993.
This Symposium was a Satellite Meeting of the XVIII International
Conference on the Physics of Electronic and Atomic Collisions
(ICPEAC) and follows a 16 year tradition of Satellite Conferences
in related areas of collisions held in association with previous
ICPEAC's. In the past each of these electron -molecule symposia
covered the broad field of electron-molecule scattering at rather
low energies, but also included hot topics. This time as well as
covering the whole field, well defined electron collisions with
clusters and with particles in the complex potential of a surface
were emphasized. Not many details are known about such collisions,
although they become more and more important in surface
characterisation, plasma-wall interactions, electron induced
desorption and reorganisation of adsorbed particles. Recently, much
work, theoretical and experimental, has been devoted to electron
collisions with rather large carbon, silicon and halogen containing
molecules. These problems are of relevance in plasma assisted thin
film formation and etching of surfaces and can now be approached
with advanced theoretical methods and experimental equipment.
An (e,2e) experiment is the measurement of an electron impact
ionization process where both the exiting electrons are detected in
coincidence. Such measurements are almost at the limit of what can
be known, in quantum mechanical terms, and its description presents
a substantial theoretical challenge. There are at least two very
good reasons for studying (e,2e) and related processes. In the
first place we are now only beginning to understand the dynamics of
the collision process. The range and sophistication of present
experiments allow us to identify kinematic regimes where delicate
and subtle effects can be observed, stretching current theories to
their limit. Secondly, the multiple coincident technique offers us
the possibility of an analytical tool that could be used to probe
the structure of the target, be it atom, molecule, thin film or
surface. Measurements are now being performed at threshold on H, on
the inner shell levels of Au and Ag using projectiles at
relativistic energies, with spin-polarized electrons on Li, on a
myriad of molecules in symmetric, noncoplanar kinematics, and on He
in a multitude of different geometries. The technique has recently
been extended to excitation ionization (e,3e) and (gamma,2e)
experiments. Major theoretical advances have also been made, but
much still remains to be done. This volume contains the invited
papers that were presented at the Workshop on (e,2e) and related
processes which took place in September/October 1992 in Cambridge,
UK. The three major review papers which it contains together form
an excellent introduction to this new and rapidly expanding area of
physics and set the scene for the wide range of research
contributions, both experimental and theoretical, from the leading
scientists in the field.
|
|