A. Fontijn et Pn. Bajaj, KINETICS OF THE SN(P-3(0)) REACTIONS WITH CO2 AND O-2 OVER WIDE TEMPERATURE RANGES, Journal of physical chemistry, 100(17), 1996, pp. 7085-7089
Rate coefficients for the title reactions have been measured by the hi
gh-temperature fast-flow reactor (HTFFR) technique. The relative conce
ntrations of Sn ground-state atoms were monitored by laser-induced flu
orescence (LIF) for Sn + CO2 --> SnO + CO and by either LIF or atomic
resonance absorption for the Sn + O-2 --> SnO + O reaction. Results fr
om these two diagnostic methods agree very well. We obtained, in units
of cm(3) molecule(-1) s(-1), k(1)(690-1600 K) = 2.3 x 10(-10) exp(-91
00 K/T) and k(2)(380-1840 K) = (5.1 x 10(-13))(T/K)(0.79) exp(-437 K/T
), with 2 sigma accuracy limits of about +/-25%. The results are compa
red to other metal atom reactions with these oxidants. All have simila
rly large preexponentials. The magnitudes of the exponential terms are
shown to be typical for a spin-forbidden and a spin-allowed reaction,
respectively.