Sciences & technologie. A, sciences exactes
Volume 0, Numéro 20, Pages 63-66
2003-12-31

Line Shapes Of Doppler-free Resonance In Srfm: Strong Atom-wall Interaction And Pressure Effect On The Frequency Shift Of An Alkali Vapor

Authors : Bouhafs B . Belaidi A .

Abstract

The attractive potential energy between the atoms of rubidium vapor and a dielectric wall has been investigated by monitoring the reflection light at the interface. The atom- wall interaction potential of the form V(z) = - C /z3 (z: atom-wall) allows to predict experimental results only for weak regime, i.e., where C<< 0.2 kHzm3. In the strong interaction case, the dispersive line shape is turned into an absorption-type line shape. The influence of atomic density on the shift of the selective reflection resonance relatively to the frequency of unperturbed atomic transition is found to be red with a negative slope. This technique opens the way to characterize the windows made of different materials thin films.

Keywords

Atomic Transition, Selective Reflection Spectroscopy, London Van der Waals Interaction, Attractive potential, Spectral Line width and Shift, Collisional effects.