Abstract
The photolysis branching ratios of 2-bromopropane have been investigated near 234 and 267 nm using resonance-enhanced multiphoton ionization with time of flight mass spectrometry. Bromine fragments monitored in this study were produced via direct dissociation of 2-bromopropane, represented by CH 3CHBrCH 3 → CH 3CHCH 3 + Br( 2P 3/2)/Br*( 2P 1/2). The branching ratios at two different excitation wavelengths were measured to be 0.534 and 0.244, respectively. The results indicated that the Br( 2P 3/2) dominated the dissociation process and the branching ratios exhibited an increasing trend with photon energy increase. Through ab initio calculation, we proposed a possible photodissociation mechanism of 2-bromopropane.
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