The 1-C4H9 + O reaction has been investigated in two quasi-static reactors
with different detection systems. From a time-resolved measurement of OH fo
rmation by laser induced fluorescence (T = 295 K, p = 21 mbar, bath gas: He
) an inverted vibrational state distribution for OH X (2)Pi (v = 0, 1, 2) w
as observed. By using Fourier transform infrared spectroscopy, relative pro
duct yields of 0.55 +/- 0.08 for 1-C4H8, 0.397 +/- 0.05 for HCHO and 0.053
+/- 0.02 for C3H7CHO were determined (T = 298 K, p = 2 mbar, bath gas: He).
The results are explained in terms of the formation and subsequent decompo
sition of an intermediate chemically activated 1-C4H9O radical and a compet
ing abstraction channel leading directly to OH + 1-C4H8. A modeling by stat
istical rate theory based on ab initio results for the stationary points of
the potential energy surface of C4H9O allows the quantitative description
of the product branching ratios. From this modeling, threshold energies of
E-06 = 55 +/- 6 and E-07 = 88 +/- 6 kJ mol(-1) for the beta -C-C and the be
ta -C-H bond dissociation, respectively, in 1-C4H9O are obtained. For the 1
,5 H atom shift, a most probable value of E-05 = 40 +/- 5 kJ mol(-1) follow
s from a comparison of our quantum chemical results with data from the lite
rature.