The electron-hole mechanism for sticking of adsorbates: A soluble model

It is shown that in the low temperature limit the electron hole dissipation mechanism recently considered by Nørskov and Lundqvist leads to a limiting sticking probability independent of adsorbate mass but dependent on adsorbate-substrate coupling strength. The dependence of sticking probability on initial adsorbate kinetic energy is also determined.     

Absorption losses in glasses and glass fibre waveguides

Glasses prepared from high purity starting materials were used for pulling optical waveguide fibre by a double crucible technique. The observed optical loss of the glasses and fibres can be accounted for by absorption bands arising from the presence of traces of transition metal ion impurities and the low energy tails of u.v. absorption bands. The relatively high loss of the fibres is attributed to leaching of impurities from the platinum crucibles.     

Relaxation shifts and plasmon excitation in absorption spectroscopy of adsorbed atoms

The excitation probability for surface plasmons, and the level shift due to the image force, are investigated when an electron is excited from a core level to an unoccupied virtual level of the adatom. The results differ strongly from the corresponding ones in XPS, in a manner depending on the energy variation of the width of the virtual level.