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Absolute rate constants for the gas-phase reaction of OH radicals with cyclohexane and ethane at 295 K

✍ Scribed by Ole J. Nielsen; Jette Munk; Palle Pagsberg; Alfred Sillesen

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 289 KB
Volume: 128
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(86)80319-0

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✦ Synopsis

The absolute rate constants for the gas-phase H-atom abstraction by hydroxyl radicals from cyclohexane and ethane have been determined at room temperature.

OH radicals were produced by pulse radiolysis of an H,O-Ar mixture, and the decay of OH was followed by monitoring the transient light absorption around 309 nm. The rate constants were found to be k = (5.24*0.36)x10-I2 and (2.98&0.21)X10-'3 cm3 molecule-' s-' for cyclohexane and ethane, respectively. These results are compared with literature data.

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We present absolute measurements of the rate constant for the reactions of OH with cyclohexane: k, = (8.6 rtO.8) x lo-" cm3 molecule-' s-l and with ethane: k3= (2.74f0.3) x lo-l3 cm3 molecule-\* s-l, both measured at room temperature by discharge flow resonance fluorescence. Our result fork, is abov