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The total attenuation cross sections, σ*, were measured for collisions of an excited atomic beam of Mg, Ca or Sr with a target of Cl 2  molecules. The experimental σ* values equal: 85 Å 2 , 100 Å 2  and 180 Å 2  for Mg*, Ca* and Sr*, respectively. Moreover, the reactive cross sections, σȒ were calculated, assuming the "harpoon mechanism" for the reactions in question. The obtained values are: σȒ* (Mg* + Cl 2 ) ≦ 61 Å 2 , σȒ* (Ca* + Cl 2 ) ≦ 102 Å 2 , σȒ* (Sr* + Cl 2 ) ≦ 130 Å 2 . The good agreement between the experimental and theoretical values shows that for this type of reaction the "harpoon mechanism" takes place

Cross Sections for the Collisions of Alkaline Earth Atoms in the 3 P Excited State with Chlorine Molecule