with the balance being O2 3 ( ) g -∑ . The average velocity of the Ar beam was 6223 m s -1 , with a fwhm of 318 m s -1 . Figure shows the translational energies of O, O2, and Ar in the O/O2 and Ar beams, as well as the relative fluxes of O and O2 in the O/O2 beam. These quantities were derived from time-of-flight (TOF) distributions, obtained by directing the beams into the mass spectrometer detector and collecting mass-selected number density distributions as a function of time, N(t), as the species in the beam passed through the detector ionizer at a time t after being formed from the laser-detonation process.