Experimental determination of the oscillator strength of the B(2B1)—X(2A2) transition of the free allyl radical

Abstract

The integrated absorption of the β₁–X transition of the methyl radical (2160 Å) and the B–X transition of the allyl radical (2100–2400 Å) were compared, in the flash photolysis of butene-1. From the f-value of the CH₃ band, the oscillator strength of the allyl transition was recorded as 0.140 (±0.028). The rate coefficient for recombination of allyl radicals was in the range 8.5(±3)× 10¹² cm³ mol^–1 s^–1.