Issue 24, 2003

Kinetic study in a microwave-induced plasma afterglow of the Fe (a 5D4) reaction with NO2 from 303 to 814 K

Abstract

A kinetic study of the reaction of ground state Fe atoms (a 5D4) with NO2 has been performed in a fast-flow reactor. A microwave-induced plasma afterglow system with H atoms reacting with the gaseous FexCl3x(g) oligomers was used as Fe atom source. The Fe atoms were monitored by atomic absorption spectroscopy (AAS) at 248.3 nm. The rate constant k1 of the reaction Fe + NO2 → products has been determined at temperatures between 303 and 814 K and was found to be equal to k1 = (4.8+0.7−0.6) × 10−10exp(−(4.5 ± 0.4)/RT kJ mol−1) cm3 molecule−1 s−1. The mechanistic implications in terms of the “electron-jump” mechanism are also discussed and it was concluded that the concept of “harpooning” is not applicable to reaction (1). Instead, the value of k1 can remarkably well be simulated in terms of the simple gas kinetic collision model.

Article information

Article type
Paper
Submitted
11 Jul 2003
Accepted
28 Oct 2003
First published
14 Nov 2003

Phys. Chem. Chem. Phys., 2003,5, 5419-5423

Kinetic study in a microwave-induced plasma afterglow of the Fe (a 5D4) reaction with NO2 from 303 to 814 K

C. Vinckier and K. Cappan, Phys. Chem. Chem. Phys., 2003, 5, 5419 DOI: 10.1039/B307892B

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