The total ionisation cross section and the large angle differential cross section for the system He(21S, 23S) + Ar, N2

Kroon, J.P.C.; Haverkorn, A.Cottaar; Beijerinck, H.W.C.

doi:10.1016/0301-0104(86)85108-4

Cited by 21 publications

(2 citation statements)

References 24 publications

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“…Molecular nitrogen and hydrogen are apolar near-isotropic species, and their ionization is expected to be very similar to the atomic cases; for these reasons, they were the first molecules to be studied. The chemi-ionization of molecular nitrogen by either Ne* or He* has also received much attention leading to the measurement of ionization cross sections and reaction channel branching ratios. ,,− In the case of Ne*+N 2 the most important observations are the vibrational excitation and the decrease of AI compared to the atomic cases. ,, The Penning ionization of N 2 by He* has shown a dependence of the ionization cross section on the Σ or Π character of the nitrogen molecular orbital …”

Section: Introductionmentioning

confidence: 99%

Study of He/Ne+Ar, Kr, N₂, H₂, D₂ Chemi-Ionization Reactions by Electron Velocity-Map Imaging

et al. 2021

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The chemi-ionization of Ar, Kr, N2, H2, and D2 by Ne(3P2) and of Ar, Kr, and N2 by He(3S1) was studied by electron velocity map imaging (e-VMI) in a crossed molecular beam experiment. A curved magnetic hexapole was used to state-select the metastable species. Collision energies of 60 meV were obtained by individually controlling the beam velocities of both reactants. The chemi-ionization of atoms and molecules can proceed along different channels, among them Penning ionization and associative ionization. The evolution of the reaction is influenced by the internal redistribution of energy, which happens at the first reaction step that involves the emission of an electron. We designed and built an e-VMI spectrometer in order to investigate the electron kinetic energy distribution, which is related to the internal state distribution of the ionic reaction products. The analysis of the electron kinetic energy distributions allows an estimation of the ratio between the two-reaction channel Penning and associative ionization. In the molecular cases the vibrational or electronic excitation enhanced the conversion of internal energy into the translational energy of the forming ions, thus influencing the reaction outcome.

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Section: Introductionmentioning

confidence: 99%

Study of He/Ne+Ar, Kr, N₂, H₂, D₂ Chemi-Ionization Reactions by Electron Velocity-Map Imaging

et al. 2021

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“…7 Penning ionization has been investigated in detail for the metastable rare gas-ground state rare gas and N 2 systems. 6,[8][9][10] In this paper we focus on the systems Ne͕2p 5 3l͖ϩAr→NeϩAr ϩ ϩe Ϫ ͑ ⑀ l ͒ ϫ ͭ lϭs, lϭ p, ⑀ l ϭ0.86 eV ⑀ l ϭ2.79 eV ͑1͒…”

Section: Introductionmentioning

confidence: 99%

Calculation of two-center integrals involving a rapidly oscillating free electron wave function

Beek

Driessen

Beijerinck

et al. 1997

The Journal of Chemical Physics

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Quantum Monte Carlo calculations of the dissociation energies of three-electron hemibonded radical cationic dimersOptical potentials are used in a quantum mechanical treatment of loss processes, e.g., ionization, where the loss of flux is described by the imaginary part. We present a numerical method for calculating two-center two-electron integrals necessary to construct the imaginary part of the optical potential. By introducing Slater-type orbitals with complex-valued exponents ͑CSTOs͒, we are able to represent the free electron wave with a limited number of CSTOs. For the representation of free electron wave functions with many oscillations, i.e., in a large r range or for a high kinetic energy, these new CSTOs form a more natural set of basis functions. The introduction of CSTOs is inevitable for the calculation of integrals concerning collisions in the mK energy range, where the interaction acts over large internuclear distances. Extensive numerical checks show that the final imaginary part of the optical potentials can be calculated with an accuracy better than 2%.

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The interaction of metastable helium atoms with alkali atoms

Ruf

Yencha

Hotop

1987

Z Phys D - Atoms, Molecules and Clusters

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The total ionisation cross section and the large angle differential cross section for the system He(21S, 23S) + Ar, N2

Cited by 21 publications

References 24 publications

Study of He/Ne+Ar, Kr, N₂, H₂, D₂ Chemi-Ionization Reactions by Electron Velocity-Map Imaging

Study of He/Ne+Ar, Kr, N₂, H₂, D₂ Chemi-Ionization Reactions by Electron Velocity-Map Imaging

Calculation of two-center integrals involving a rapidly oscillating free electron wave function

The interaction of metastable helium atoms with alkali atoms

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The total ionisation cross section and the large angle differential cross section for the system He(21S, 23S) + Ar, N2

Cited by 21 publications

References 24 publications

Study of He*/Ne*+Ar, Kr, N2, H2, D2 Chemi-Ionization Reactions by Electron Velocity-Map Imaging

Study of He*/Ne*+Ar, Kr, N2, H2, D2 Chemi-Ionization Reactions by Electron Velocity-Map Imaging

Calculation of two-center integrals involving a rapidly oscillating free electron wave function

The interaction of metastable helium atoms with alkali atoms

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Product

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About

Study of He/Ne+Ar, Kr, N₂, H₂, D₂ Chemi-Ionization Reactions by Electron Velocity-Map Imaging

Study of He/Ne+Ar, Kr, N₂, H₂, D₂ Chemi-Ionization Reactions by Electron Velocity-Map Imaging