Reactions of photochemically produced hydrogen atoms at energies below 1.8 electron volts

Abstract

The addition of I2 to HI-RD photolysis systems at 40°has been shown to unambiguously differentiate between products which arise by reaction of hot H atoms and those of thermal H atoms by efficiently removing the latter. Hot H atoms, formed with maximum initial energy of 1.8 eV by photolysis of HI at 253.7 nm, have been found to preferentially abstract hydrogen over deuterium from partially deuterated ethanes by a factor of 5 to 8. S1D4, Si2De, and CH3SÍD3 >vere also studied and found to be much more reactive than their carbon analogs.Comparison of this research at very low total pressures, ca. 2 Torr, with earlier research on these systems in the hundred Torr region, showed that the ratio of the probability of moderation to reaction, h/ku, was pressure independent for the perdeuteriohydrocarbons and partially deuterated ethanes studied.tive criticism of the earlier version of this manuscript was extremely valuable to one of us (G. J. M.) in revision.Reactions of Iodine with Olefins. III. Radiative Neutron Capture Induced Reactions of Iodine-128 with Gaseous Ethylene and Propylene1