scholarly journals Discharge-flow/chemiluminescence and flash-photolysis/resonance fluorescence studies of the reaction O + SiH4 at room temperature

1993 ◽  
Vol 25 (3) ◽  
pp. 183-191 ◽  
Author(s):  
Craig A. Taylor ◽  
Luying Ding ◽  
Paul Marshall
Keyword(s):  
Room Temperature ◽  
Flash Photolysis ◽  
Resonance Fluorescence ◽  
Discharge Flow ◽  
Fluorescence Studies

Rate of the OH + C6H6 + He reaction in the fall-off range by discharge flow and OH resonance fluorescence

1991 ◽  
Vol 69 (7) ◽  
pp. 1057-1064 ◽  
Author(s):  
A. Goumri ◽  
J. F. Pauwels ◽  
P. Devolder
Keyword(s):  
Rate Constant ◽  
Room Temperature ◽  
Flash Photolysis ◽  
Tropospheric Chemistry ◽  
Resonance Fluorescence ◽  
Discharge Flow ◽  
Gas Phase Kinetics ◽  
Radical Adduct ◽  
Fluorescence Reaction ◽  
Two Temperatures

The rate constant k1 of the reaction[Formula: see text]has been investigated by discharge flow resonance fluorescence of OH in the fall-off pressure range. From systematic measurements at five pressures between 0.5 and 9.5 torr, the Troe parameters k0 and k∞ (with Fc = 0.6) have been derived at two temperatures: room temperature and 353 K. For room temperature, (297 ± 3) K, these parameters are k0 = (1.7 ± 0.5) × 10−29 cm6 molecule−2 s−1, k∞, = (10 ± 2) × 10−13 cm3 molecule−1 s−1. Our experimental results are consistent with addition as the dominant path, in agreement with flash photolysis investigations and with the existence of a fast reaction with NO2 of the (OH—benzene) radical adduct. A numerical simulation shows that this latter reaction should have a rate constant of (4 ± 2) × 10−11 cm3 molecule−1 s−1 at 353 K. Key words: gas phase kinetics, discharge flow, resonance fluorescence, reaction of OH with benzene, tropospheric chemistry.

Room-Temperature Reactions of the Intermediate(s) Generated by Flash Photolysis of (η5-C5H5)Fe(CO)2CH3

1998 ◽  
Vol 17 (6) ◽  
pp. 1166-1168 ◽  
Author(s):  
Karen L. McFarlane ◽  
Peter C. Ford
Keyword(s):  
Room Temperature ◽  
Flash Photolysis

Measurement of the diffusion coefficients of reactive species in dilute gases

1982 ◽  
Vol 380 (1779) ◽  
pp. 241-258 ◽  
Keyword(s):  
Gas Phase ◽  
Diffusion Coefficients ◽  
Atmospheric Pressure ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Reactive Species ◽  
Resonance Fluorescence ◽  
Hydrogen Atoms ◽  
Chromatographic Effect ◽  
Diffusion Of Hydrogen

A technique has been developed for measuring the diffusion coefficients of atoms and other reactive species in gases below atmospheric pressure. The technique consists of measuring the rate of dispersion of a pulse of reactive species in a stream of gas flowing rapidly ( ca . 10 m s -1 ) down a quartz tube. The reactive species are observed and the profile of the pulses measured by using resonance fluorescence. The technique has been used at room temperature, but in principle measurements could be made at elevated temperatures. Measurements have been made of the rates of diffusion of hydrogen atoms in argon and nitrogen, and values for the diffusion coefficients of 1.61 ± 0.04 and 1.35 ± 0.03 cm 2 s -1 respectively, at 1 atmosphere ( ca . 10 5 Pa) and 294 K, have been obtained. Incidentally to the primary purpose of the experiment, it was observed that the hydrogen atoms spend a small fraction of their time of passage along the tube reversibly adsorbed on its walls. From the measurements, both the partition coefficient, giving the ratio of hydrogen atoms on the walls to those in the gas phase, and the rates of adsorption and desorp­tion can be obtained. This appears to be the first observation of a chromatographic effect for a highly reactive species.

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