@article {33051,
	title = {Rate constants and kinetic isotope effects for H-atom abstraction reactions by muonium in the Mu + propane and Mu + n-butane reactions from 300 K to 435 K: challenges for theory},
	journal = {Phys. Chem. Chem. Phys.},
	volume = {22},
	year = {2020},
	pages = {6326-6334},
	abstract = {<p>This paper reports measurements of the temperature dependence of the rate constants for H-atom abstraction reactions from propane and n-butane by the light isotopic H-atom muonium (Mu){,} kMu(T){,} over temperatures in the range 300 K to 435 K. Simple Arrhenius fits to these data yield activation energies{,} EMua{,} that are some 2\&ndash;4 times lower than EHa found from corresponding fits for the H + propane and H + n-butane reactions studied elsewhere{,} both experimentally and theoretically{,} and fit over a similar temperature range. These activation energies EMua are also much lower than estimated from zero-point-energy corrected vibrationally adiabatic potential barriers{,} both results suggesting that quantum tunneling plays an important role in determining kMu(T) and for the Mu + propane reaction in particular. The results are expected to pose a considerable challenge to reaction rate theory for isotopic H-atom reactions in alkane systems.</p>},
	doi = {10.1039/C9CP06822H},
	url = {http://dx.doi.org/10.1039/C9CP06822H},
	author = {Fleming, Donald G. and Arseneau, Donald J. and Cottrell, Stephen P. and Peck, Jamie N. T.}
}
