Crossed-beam scattering of F+CD_4 - DF + CD_3(vNK): The integral cross sections

摘要

The title reaction was investigated in a crossed-beam experiment. A (2 + 1) resonance-enhanced multiphon ionization technique was used to interrogate the internal-state distributions of the CD_3 product at three different collision energies. Only the v_2 (umbrella) mode excitation was observed. Its distribution changes from a monotonically declined distribution at low energy to a slightly inverted one at higher collision energy. Although the rotational excitations of CD_3 were small, a strong preference for K = 0 was found, indicative of the dominance of the tumbling rotation motion of the CD_3 product. The vibration-resolved excitation functions were also measured for v_2 = 0-3. A reaction barrier of 0.5 kcal/mol was deduced.