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Quantum mechanical effects on the angular distribution of HF products from the F + H 2 reaction were studied using crossed atomic and molecular beams with a rotatable mass spectrometer detector and timeof—flight velocity analysis. Measurement of the singlet—triplet splittiny of CH 2 from the recoil velocities of fragments from ketene photodissociation in a molecular beam are also reported. Partial center—of—mass angular distributions, and velocity flux contour maps have been derived for individual vibrational states of the HF product from the F + H 2 reaction at collision energies of 2 and 3 kcal/mole. The center—of—mass distributions were obtained by analysis of laboratory angular and time—of—flight measurements of the reactive scattering. The results are consistent with recent three dimensional quantum mechanical scattering calculations, which predict that resonance effects should appear in the product angular distributions in this energy range. The photofragmentation of ketene in a molecular beam was used to measure the singlet—triplet splitting in CH 2 . A rare gas halide excimer laser operating at 351 nm (XeF) and 308 nrn (XeC1) dissociated the ketene. Time-of-flight measurements of the fragment ve]ocities allowed determination of the energetics of the dissociation. The

Molecular beams studies of the energetics and dynamics of elementary chemical reactions