UV absorption spectrum and kinetics of the self-reaction of neopentyl radicals in the gas phase at 298 K
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Neopentyl radicals were produced via the reaction F+(CH3)4C→(CH3)3CCH 2+HF, which was initiated by pulse radiolysis of neopentane/SF6 gas mixtures at 298 K. The ultraviolet absorption spectrum of neopentyl radicals has been recorded over the wavelength range 220-270 nm. An absorption cross section, σ(CH3)3CCH2 (240 nm)=(4.88±0.42) × 10-18 cm2 molecule-1, has been obtained based on absolute yields using CH3O2 as a reference. The decay of neopentyl radicals was found to follow second-order kinetics in accordance with the self-reaction 2(CH3)3CCH2→ products, with an absolute bimolecular rate constant of (2.1±0.2) × 10-11 cm3 molecule-1 s-1 (±2σ).
Original language | English |
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Journal | Chemical Physics Letters |
Volume | 203 |
Issue number | 2-3 |
Pages (from-to) | 302-306 |
Number of pages | 5 |
ISSN | 0009-2614 |
DOIs | |
Publication status | Published - 19 Feb 1993 |
ID: 228192481