Ionization of ammonia molecules by collision with metastable neon atoms

Arfa, M. Ben; Lescop, Benoît; Cherid, M.; Brunetti, Brunetto Giovanni; Candori, Pietro; Malfatti, D.; Falcinelli, Stefano; Vecchiocattivi, Franco

doi:10.1016/s0009-2614(99)00569-2

Cited by 37 publications

(40 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 9 shows the results obtained for NH 3 (black circles) and ND 3 (red triangles), respectively. While at higher collision energies the branching ratio for NH 3 varied with collision energy, 27 the branching ratios measured here are both almost constant, ≈ 0.3, over the entire range of collision energy even though the measurements span over three orders of magnitude. This result agrees with the simplest form of the MQDT reaction model, but that model assumes energy-independent quantum defects that at this point can not be justified (this would require a comparison to calculations involving a full PES).…”

Section: Theorymentioning

confidence: 60%

“…(2)). 27,28 In the present work, the behaviour of the branching ratio = 3 , respectively. MG and EG are a magnetic and electric guide, respectively.…”

Section: Introductionmentioning

confidence: 75%

“…The missing electron from the N-H bond reduces the strength of that bond in theÃ-state. Indeed, for Ne * +NH 3 two reaction channels have been observed experimentally, 27 Ne * + NH 3 → Ne + NH…”

Section: Introductionmentioning

confidence: 99%

“…PI has been shown previously to be predominantly vibrationally adiabatic, 24,26 and this has also been observed for the present reaction. 27 However, as shown in Fig. 1 2 which means that an electron has been removed from one of the N-H bond orbitals.…”

Section: Introductionmentioning

confidence: 99%

“…(1) is believed to proceed through theX state, while the second one goes through thẽ A state. The most detailed study of this reaction to date has been done by Ben Arfa et al 27 who measured the cross section and branching ratio of Eqs. (1) and (2) at 300 K <E coll /k B < 3000 K. An important result of that study is that the fraction of NH + 2 products increases with increasing collision energy.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dynamics of gas phase Ne* + NH3 and Ne* + ND3 Penning ionisation at low temperatures

Jankunas

Bertsche

Jachymski

et al. 2014

The Journal of Chemical Physics

152

View full text Add to dashboard Cite

Analytical potential energy surface for the NH3+HNH2+H2 reaction: Application of variational transition-state theory and analysis of the equilibrium constants and kinetic isotope effects using curvilinear and rectilinear coordinates J. Chem. Phys. 106, 4013 (1997) product ions, respectively. The cross sections for both reactions were found to increase with decreasing collision energy, E coll , in the range 8 μeV < E coll < 20 meV. The measured rate constant exhibits a curvature in a log(k)-log(E coll ) plot from which it is concluded that the Langevin capture model does not properly describe the Ne * + NH 3 reaction in the entire range of collision energies covered here. Calculations based on multichannel quantum defect theory were performed to reproduce and interpret the experimental results. Good agreement was obtained by including long range van der Waals interactions combined with a 6-12 Lennard-Jones potential. The branching ratio between the two reactive channels, =, is relatively constant, ≈ 0.3, in the entire collision energy range studied here. Possible reasons for this observation are discussed and rationalized in terms of relative time scales of the reactant approach and the molecular rotation. Isotopic differences between the Ne * + NH 3 and Ne * + ND 3 reactions are small, as suggested by nearly equal branching ratios and cross sections for the two reactions. © 2014 AIP Publishing LLC.

show abstract

Section: Theorymentioning

confidence: 60%

“…(2)). 27,28 In the present work, the behaviour of the branching ratio = 3 , respectively. MG and EG are a magnetic and electric guide, respectively.…”

Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dynamics of gas phase Ne* + NH3 and Ne* + ND3 Penning ionisation at low temperatures

Jankunas

Bertsche

Jachymski

et al. 2014

The Journal of Chemical Physics

152

View full text Add to dashboard Cite

show abstract

Stereodynamics in the Collisional Autoionization of Water, Ammonia, and Hydrogen Sulfide with Metastable Rare Gas Atoms: Competition Between Intermolecular Halogen and Hydrogen Bonds

Falcinelli

Bartocci

Cavalli

et al. 2015

Chemistry A European J

View full text Add to dashboard Cite

Recent experiments on the title subject, performed with a high-resolution crossed-beam apparatus, have provided the total ionization cross sections as a function of the collision energy between noble gas atoms, electronically excited in their metastable states (Ng*), and H2 O, H2 S, and NH3 reagents, as well as the emitted electron energy spectra. This paper presents a rationalization of all the experimental findings in a unifying picture to cast light on the basic chemical properties of Ng* under conditions of great relevance both from a fundamental and from an applied point of view. The importance of this investigation is that it isolates the selective role of the intermolecular halogen and hydrogen bonds, to assess their anisotropic effects on the stereodynamics of the promoted ionization reactions, and to model energy transfer and reactivity in systems of applied interest, such as planetary atmospheres, plasmas, lasers, and flames.

show abstract

Analytical Potential Energy Formulation for a New Theoretical Approach in Penning Ionization

Falcinelli

Rosi

Vecchiocattivi

et al. 2019

Computational Science and Its Applications – ICCSA 2019

View full text Add to dashboard Cite

Ionization of ammonia molecules by collision with metastable neon atoms

Cited by 37 publications

References 27 publications

Dynamics of gas phase Ne* + NH3 and Ne* + ND3 Penning ionisation at low temperatures

Dynamics of gas phase Ne* + NH3 and Ne* + ND3 Penning ionisation at low temperatures

Stereodynamics in the Collisional Autoionization of Water, Ammonia, and Hydrogen Sulfide with Metastable Rare Gas Atoms: Competition Between Intermolecular Halogen and Hydrogen Bonds

Analytical Potential Energy Formulation for a New Theoretical Approach in Penning Ionization

Contact Info

Product

Resources

About