Nuclear-excited Feshbach resonance in the Ar(3P)+CH3Br Penning ionization reaction under orientation and velocity specified collisions

Okada, S.; Ohoyama, Hiroshi; Kasai, Toshio

doi:10.1063/1.1511185

Cited by 8 publications

(1 citation statement)

References 25 publications

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“…[14][15][16][17][18] We are aware of only two other studies where resonances were observed in the elastic scattering of polyatomic molecules. 19,20 This paper reports the observation of reactive scattering resonances in Penning Ionization (PI) of a polyatomic molecule with metastable helium. Specifically, the He( 3 S 1 ) + NH 3 PI reaction is investigated in the collision energy (E coll ) range 38 mK < E coll /(k B T) < 125 K. In contrast to atoms and diatomic molecules, polyatomic molecules have a further reduced symmetry and allow for a potentially more complex stereochemistry.…”

Section: Introductionmentioning

confidence: 99%

Observation of orbiting resonances in He(3S1) + NH3 Penning ionization

Jankunas

Jachymski

Hapka

et al. 2015

The Journal of Chemical Physics

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Resonances are among the clearest quantum mechanical signatures of scattering processes. Previously, shape resonances and Feshbach resonances have been observed in inelastic and reactive collisions involving atoms or diatomic molecules. Structure in the integral cross section has been observed in a handful of elastic collisions involving polyatomic molecules. The present paper presents the observation of shape resonances in the reactive scattering of a polyatomic molecule, NH3. A merged-beam study of the gas phase He((3)S1) + NH3 Penning ionization reaction dynamics is described in the collision energy range 3.3 μeV < Ecoll < 10 meV. In this energy range, the reaction rate is governed by long-range attraction. Peaks in the integral cross section are observed at collision energies of 1.8 meV and 7.3 meV and are assigned to ℓ = 15,16 and ℓ = 20,21 partial wave resonances, respectively. The experimental results are well reproduced by theoretical calculations with the short-range reaction probability Psr = 0.035. No clear signature of the orbiting resonances is visible in the branching ratio between NH3 (+) and NH2 (+) formation.

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Section: Introductionmentioning

confidence: 99%

Observation of orbiting resonances in He(3S1) + NH3 Penning ionization

Jankunas

Jachymski

Hapka

et al. 2015

The Journal of Chemical Physics

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Collision-energy resolved steric effect on the Penning ionization reaction of tert-butyl bromide and Kr(3P)

Koizumi

Ohoyama

Kasai

2003

Chemical Physics Letters

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Orienting and aligning molecules for stereochemistry and photodynamics

Aquilanti

Bartolomei

Pirani

et al. 2005

Phys. Chem. Chem. Phys.

124

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Production, characterization and control of polarization states of molecules (specifically, alignment and/or orientation) are of importance for investigating in detail the stereodynamics of elementary processes involving elastic, inelastic and reactive events and also to prepare targets for selective photodynamical investigations. The focus here is on those molecular beam techniques which show perspectives in the applications offering appealing features for "duty cycle" and intensity characteristics. After a review of the basic experimental advances, mainly obtained in the last ten years, the attention will be addressed to recent studies carried out on the collisional alignment of hydrocarbon molecules and on orientation of symmetric top molecules by exploiting honeycomb hexapole fields. The first case is a prototype of "natural" polarization techniques, the second one of those where polarization is "forced" by external fields.

show abstract

Nuclear-excited Feshbach resonance in the Ar(3P)+CH3Br Penning ionization reaction under orientation and velocity specified collisions

Cited by 8 publications

References 25 publications

Observation of orbiting resonances in He(3S1) + NH3 Penning ionization

Observation of orbiting resonances in He(3S1) + NH3 Penning ionization

Collision-energy resolved steric effect on the Penning ionization reaction of tert-butyl bromide and Kr(3P)

Orienting and aligning molecules for stereochemistry and photodynamics

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