期刊
JOURNAL OF CHEMICAL PHYSICS
卷 143, 期 20, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4934995
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资金
- Air Force Office of Scientific Research [AFOSR-2303EP]
- Boston College Institute of Scientific Research
- National Research Council Research Associateship Program
The kinetics of chemi-ionization reactions of neodymium and samarium atoms with an oxygen atom to yield a metal monoxide cation and electron were studied using a flow tube apparatus over a temperature range of 150-450 K. Nd reacts efficiently with O, near the hard-sphere collision limit at all temperatures, with a rate constant of 3 x 10(-10) cm(3) s(-1) at 300 K and a slight positive temperature dependence. No chemi-ionization of Nd with N2O was observed, despite the reaction being exothermic. Chemi-ionization of Sm with O is slow, with a rate constant at 300 K determined to be 7 x 10(-12) cm(3) s(-1), although with large uncertainty. The Sm reaction also shows a slightly positive temperature dependence, described by a small activation energy of 60 meV. Although not definitive, the data suggest that excited states of Sm react efficiently whereas ground state Sm reacts inefficiently. (C) 2015 AIP Publishing LLC.
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