[en] Research activities with crossed molecular beams at Lawrence Berkeley Laboratory during 1976 are described. Topics covered include: scattering of Ar*, Kr*, with Xe; metastable rare gas interactions, He* + H₂; an atomic and molecular halogen beam source; a crossed molecular beam study of the Cl + Br₂ → BrCl + Br reaction; O(³P) reaction dynamics, development of the high pressure plasma beam source; energy randomization in the Cl + C₂H₃Br → Br + C₂H₃Cl reaction; high resolution photoionization studies of NO and ICl; photoionization of (H₂O)/sub n/ and (NH₃)₂; photoionization mass spectroscopy of NH₃⁺ and O₃⁺; photo fragmentation of bromine; and construction of chemiluminescence-laser fluorescence crossed molecular beam machine