  A new research project on spectral analysis that aims to characterize the
vertical stratification of element abundances in stellar atmospheres of
chemically peculiar (CP) stars is discussed in detail. Some results on
detection of vertical abundance stratification in several slowly rotating main
sequence CP stars are presented and considered as an indicator of the
effectiveness of the atomic diffusion mechanism responsible for the observed
peculiarities of chemical abundances. This study is carried out in the frame of
Project VeSElkA (Vertical Stratification of Elements Abundance) for which 34
slowly rotating CP stars have been observed with the ESPaDOnS
spectropolarimeter at CFHT.
