Dicke Narrowing Effect for r-v-type Collisional Potential

\ In this paper we present results of spectral profile shape calculations for the r(-v)-type collisional potential. The attention is drown to the Dicke narrowing, however we also refer to the speed-dependent effects. Our considerations were performed within the impact approximation. It was also assumed that dephasing and velocity-changing contributions to the collisions are statistically independent. We found that changing the potential type the collisional effects influence on the line shapes can vary by more then 10%. Therefore it is relevant not only for the ultraaccurate spectroscopy, where model accuracy up to 10(-6) is required, but also in more common applications.