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Thermal Kinetics of Aln + O2 (n = 2–30): Measurable Reactivity of Al13

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journal contribution
posted on 28.06.2019, 00:00 by Brendan C. Sweeny, Shaun G. Ard, Albert A. Viggiano, Jordan C. Sawyer, David C. McDonald II, Nicholas S. Shuman
Mass-selected aluminum anion clusters, Aln, were reacted with O2. Rate constants (300 K) for 2 < n < 30 and product branching fractions for 2 < n < 17 are reported. Reactivity is strongly anticorrelated to Aln electron binding energy (EBE). Al13 reacts more slowly than predicted by EBE but notably is not inert, reacting at a measurable 0.05% efficiency (2.5 ± 1.5 × 10–13 cm3 s–1). Al6 is also an outlier, reacting more slowly than expected after accounting for other factors, suggesting that high symmetry increases stability. Implications of observed Al13 reactivity, contributions of both electronic shell-closing and geometric homogeneity to Aln resistance to O2 etching, and future directions to more fully unravel the reaction mechanisms are discussed.