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The absorption cross section of the HCO radical at 614.59 nm and the rate constant for HCO+HCO → H2CO+CO

✍ Scribed by J.E. Baggott; H.M. Frey; P.D. Lightfoot; R. Walsh

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 587 KB
Volume: 132
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(86)80112-9

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✦ Synopsis

Using a combination of XeCl exciplex laser flash photolysis of gas-phase glyoxal and formaldehyde and time-resolved cw dye laser absorption at 614.59 nm, we have determined the ratio k,/a for the reaction HCO+HCO-H,CO+CO

(1) at 295k2 K. Similar studies involving the 308 nm photolysis of a variety of aldehydes combined with a determination of the absolute yields of the resulting hydrocar~n products have allowed us to deduce the initial yields of HCO radicals and hence the absorption cross section for HCO at the monito~ng wavelength. We find d= (2.3 20.6) x IO-" cm*, giving kr = (7.5 & 2.9) X lo-"cm3 molecule-' s-'. Our values are compared with previous results.

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Temperature and pressure dependence of r

Temperature and pressure dependence of rate constants for the clustering reaction: HCO+ + CO + H2 = H(CO)2+ + H2

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Rate constants for the reactions of H2O+

Rate constants for the reactions of H2O+ with NO2, O2, NO, C2H4, CO, CH4, and H2 measured at relative kinetic energies 0.04–2 eV

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The rate consorts of several H=O+ reactions have been measured as a function of relative kinetic energy in a ffow&ift tube The reactions were found to proceed in a variety of ways -charge transfer, proton transfer. and H-aom &strxtton and to have onl) moderate kinetic-energy dependences.