Rate constants for the gas-phase reactions of Cl-atoms with C2C8 alkanes at T = 296 ± 2 K

✍ Scribed by Parisa Ariya Hooshiyar; Hiromi Niki

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 546 KB
• Volume: 27
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550271206

✦ Synopsis

Relative rate constants for the gas-phase reactions of C1-atom with thirteen atmospherically interesting alkanes ( c 2 -C ~) have been determined at 296 i-2 K based on GC/FID measurements of their relative decays in the UV (A 2 300 nm) photolysis of mixtures containing Cl2 and the entire series of the selected alkanes in the mtorr range in 750 torr of Nz. The following absolute rate constants (in units of cm3 molecule-' s-') have been derived from the relative rate constants combined with the value of 1.94 X lo-'' cm3 molecule-' 5-l for the C1 + n-butane reaction: ethane (0.57 2 0.05); propane (1.27 t 0.02); 2methyl propane (1.30 5 O.Ol), 2-methyl butane (1.96 _f 0.02)), n-pentane (2.50 2 0.02); 2,3-dimethyl butane (2.00 2 0.06); 2-methyl pentane (2.58 _f 0.08); n-hexane (3.05 -+ 0.04); 2-methyl hexane (3.12 i-0.04); nheptane (3.65 t-0.06); 2,2,4-trimethyl pentane (2.25 2 0.08); and n-octane (4.09 ? 0.12). The uncertainties indicated are two least-squares standard deviations ( 2 ~) .

These rate constants are compared with literature values and their applicability to Arctic tropospheric conditions is discussed.