Laser-induced collisional energy transfer: high precision measurements of the spectral lineshape in weak-field regime

In this paper we report the measurement of the spectral line shape for the laser-in- duced collisional energy transfer reaction between europium and strontium atoms. Cross-sec tions were measured in a frequency range of 70 cm-1. Comparison with numerical results ob- tained by Monte Carlo simulation shows good agreement over the full line shape.