Kinetic studies and ab initio investigations of the reactions of atomic bromine with methylsilane and dimethylsilane

Kinetic Studies of the Reactions of Atomic Hydrogen with Iodoalkanes

“…The temperature T in the reaction zone was monitored with a thermocouple, corrected for radiation errors of up to 10 K, before and after each set of k X measurements, and is expected to be accurate to within (2%. 17 The average residence time of gas mixtures in the heated reactor before photolysis τ res was varied to check for possible pyrolysis of the iodoalkanes, while the energy discharged through the flash lamp F was varied to alter the initial radical concentrations. The Ar (Air Products, 99.997%) was used directly from the cylinder and NH 3 (MG Industries, 99.99%) was purified by freeze-pump-thaw cycles from 77 K. The iodoalkanes (CH 3 I, Aldrich, 99% and 99.5%; CD 3 I, Aldrich, 99.5+ atom % D; C 2 H 5 I, Lancaster, 99%; CH 3 CHICH 3 , Aldrich, 99%; (CH 3 ) 3 CI, Aldrich, 95%) were purified by distillation to remove any iodine contamination.…”

Kinetic and modeling studies of the reaction S+H2S

“…Actinic radiation entered through one side arm and probe radiation from a resonance lamp through a second side arm, and fluorescence was observed through a third mutually perpendicular side arm. The temperature in the reaction zone, defined by the intersection of the three side arms, was measured with a retractable, sheathed, unshielded thermocouple corrected for radiation errors [14].…”

Kinetic studies of the reaction NH2+H2S

“…An example is shown in Figure 1. Initial radical concentrations were estimated from the UV absorption cross sections of H 2 S and NH 3 , and the temperature in the reaction zone was monitored before and after experiments with a thermocouple and corrected for radiation errors [9]. Figure 2 is a plot of k ps1 vs. reactant concentration, whose slope equals the bimolecular rate constant k 1 .…”