Crossed molecular beam experiments that use laser-induced fluorescence spectroscopy as the detector allow measurements of the internal state distribution in the products of chemical reactions studied under well-controlled single-collision conditions. This technique provides direct information on the chemical dynamics and the intermolecular potential surfaces. Application to the reactions H plus NO//2 yields OH plus NO and O(**3P) plus C//6H//1//2 yields OH plus C//6H//1//1 is discussed where the OH state distribution has been measured.