By exploiting two different Cl-beam sources and concurrently monitoring the concentrations of the two reagents [Cl(P-2(3/2)) and Cl*(P-2(1/2))] and the H- or D-atom product, the spin-orbit specific excitation functions of the title reactions were determined. The exceptionally large nonadiabatic reactivity for Cl*(P-2(1/2))+n-H-2, inferred in our previous differential cross section investigation, is now confirmed and quantified. The isotope effects for both the spin-orbit ground and excited reagents are also elucidated.