Experimental and theoretical differential cross sections for the reactions between Cl atoms and two isotopic variants of molecular hydrogen and are presented. The experimental results have been obtained by using the crossed molecular beam method with mass spectrometric detection. The theoretical results have been computed using both the quasiclassical trajectory and quantum mechanical (QM) methods. The potential energy surface employed for the calculations is the ab initio BW2 surface by Bian and Werner [J. Chem. Phys. 112, 220 (2000)]. The theoretical results have been directly compared to the experiments in the laboratory frame at a collision energy of 4.25 and 5.85 kcal/mol for the reaction and of 4.9 and 6.3 kcal/mol for the reaction. The agreement between QM results and experiment is quite satisfactory for the reaction, especially for the low collision energy, while for is less good, especially when considering data at the lower
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