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Hydride abstraction by NO from ethanol: Effects of collision energy

Summary: Hydride abstraction by NOż
from ethanol: Effects of collision energy
and ion rotational state
Richard J. Green, Jun Qian, Ho-Tae Kim, and Scott L. Andersona)
Chemistry Department, University of Utah, Salt Lake City, Utah 84112
Received 5 April 2000; accepted 22 May 2000
The effects of NO rotational state and collision energy on the reaction NO C2H5OH
HNO C2H4OH were studied in a guided-ion-beam instrument over the collision energy range
from 50 meV to 3.7 eV. Integral cross sections for the reaction are presented. NO is prepared in
specific rotational levels N 0,1 and N 10 by means of mass-analyzed threshold ionization.
Ab initio calculations were used to probe stationary points on the potential energy surface. The
reaction is sharply inhibited by collision energy, suggesting a bottleneck for reaction. If rotational
energy had a similar effect, 50% inhibition from N 10 excitation would be observed at low
collision energy. Instead, rotation is found to have no effect within experimental error. A precursor
complex mechanism is proposed to explain the results. © 2000 American Institute of Physics.
S0021-9606 00 00232-4
Hydride (H ) abstraction by NO from hydrocarbons is
a common reaction used in chemical ionization mass spec-
trometry. As a consequence, the thermal rate constants for


Source: Anderson, Scott L. - Department of Chemistry, University of Utah


Collections: Energy Storage, Conversion and Utilization; Materials Science; Chemistry