Deuterium isotope effect on the orientation dependence of cyanogen(B) radical formation in the reaction of argon(3P) with acetonitrile-d3

Abstract

The orientation dependence of CN(B) radical formation in the reaction of the Ar(3P) atoms with oriented CDjCN molecules by use of a hexapole electrostatic field was studied, and the dissimilar orientational anisotropy as compared with that for the reaction with the oriented CH3CN molecules was found. This difference in stereoanisotropy suggests that the CN(B) formation has at least two reaction processes. These processes are relevant to anisotropic and isotropic molecular orbitals of acetonitrile at the stage of energy transfer from the Ar(3P) atoms. The emission spectra of the CN(B) radicals for both reactions with randomly oriented acetonitrile were observed to investigate the relationship between the vibrational excitation of the CN(B) radical and branching either to CN(B) formation or to hydrogen atomization.

Formation of the State‐Selected CH Radical Beam and its Application to The CH + NO Reaction

“…The detail of the crossed-beam apparatus has been described elsewhere. 5,6 The beam source and the discharge unit were Figure 1 Schematic view of the CH radical beam source and the crossed beam apparatus with the 60-cm electrostatic hexapole field. Inner panel: CH radical beam source.…”

“…However, this possibility is also ruled out by the following reason: As for the methoxy radical which has an unpaired electron at the oxygen atom5, the internal couplings, such as the Jahn-Teller and spin-orbit effect, cause the situation that the various axial components (the electron-spin, the vibration, the electron-orbital angular momentum and K) are not good quantum numbers. 6 Instead of these quantum numbers, only G is well known as a good quantum number. 7 In order to check the contribution of the methoxy radical, the focusing curve of methoxy radical was calculated by the Monte Carlo trajectory simulation for the ideal case that K is a good quantum number.…”

Directions of chemical change: experimental characterization of the stereodynamics of photodissociation and reactive processes

“…Experimentally, several relevant results have been obtained by the electrostatic hexapole technique. 1,[64][65][66][67][68][69][70][71][72][73][74] Studies have also been aimed at clarifying the role of the molecular orbital shape in affecting the product branching ratios. [75][76][77] Dynamical stereochemistry for four-center processes has been a challenging target, with the reaction dynamics being exceedingly more complicated than for three-atom processes.…”

Orientation Dependence of the CF3* Formation in Collisional Energy Transfer Reactions: CF3Cl + Ar(3P) .fwdarw. CF3* + Cl + Ar and CF3Br + Kr(3P) .fwdarw. CF3* + Br + Kr

“…Figure3. Schematic illustration of the step-function model employed for three reactive sites, in which the CF3X molecule is regard as a hard sphere with three reactive zones.…”