Reactive collisions involving the BeH molecular system

Larson, Åsa; Roos, Johanna Brinne; Hedberg, Hanae; Orel, A. E.

doi:10.1088/1742-6596/576/1/012003

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…This suggests that the MQDT model gives a better description of the cross section behaviour at very low energies, compared to the results obtained with R-matrix curves within the local complex-potential model. For higher energies above ∼2 eV, the present calculations can be compared with the results for = + v 0 of the [10] (figure 6) and [32] (figure 2), which report the cross sections for DR process obtained by using the wave packet method (WPM) for the description of the nuclear dynamics, and the Kohn method for potential and width calculations. These data, in good agreement with the present MQDT calculations at the threshold (see also figure 7 of [12]), show very rapid decay for energies above 2 eV becoming, at 10 eV, about two orders of magnitude smaller than the present results obtained with the R-matrix curves.…”

Section: Dissociative Recombinationmentioning

confidence: 99%

Theoretical resonant electron-impact vibrational excitation, dissociative recombination and dissociative excitation cross sections of ro-vibrationally excited BeH⁺ ion

Laporta

Chakrabarti²,

Celiberto

et al. 2017

Plasma Phys. Control. Fusion

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We provide cross sections and Maxwell rate coefficients for reactive collisions of slow electrons with BeH + ions on all the eighteen vibrational levels (X 1 Σ + , v + i = 0, 1, 2,. .. , 17) using a Multichannel Quantum Defect Theory (MQDT)-type approach. These data on dissociative recombination, vibrational excitation and vibrational de-excitation are relevant for magnetic confinement fusion edge plasma modelling and spectroscopy, in devices with beryllium based main chamber materials, such as the International Thermonuclear Experimental Reactor (ITER) and the Joint European Torus (JET). Our results are presented in graphical form and as fitted analytical functions, the parameters of which are organized in tables.

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Section: Dissociative Recombinationmentioning

confidence: 99%

Theoretical resonant electron-impact vibrational excitation, dissociative recombination and dissociative excitation cross sections of ro-vibrationally excited BeH⁺ ion

Laporta

Chakrabarti²,

Celiberto

et al. 2017

Plasma Phys. Control. Fusion

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A high sensitivity, high resolution tandem mass spectrometer to research low-energy, reactive ion–surface interactions

Ballauf

Duensing

Hechenberger

et al. 2020

Review of Scientific Instruments

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The device described is the combination of two mass spectrometers, with a surface sample placed between them. Its aim is to allow for detailed research on low-energy ion–surface interactions, involving and triggering surface chemistry. This task is fulfilled by a carefully chosen geometry: Projectile ions from an electron impact source are mass-per-charge selected using a quadrupole. Such continuous bombardment allows for good control of the surface condition. Species emerging from the collisions are focused onto a beam and analyzed using a purpose-built orthogonal pulsing time-of-flight mass spectrometer. Neutral species can be post-ionized using a second electron impact source. Neutral gases can be adsorbed to the surface from the gas phase in a controlled manner, using a feedback-controlled pressure regulator. In order to minimize the discrimination of secondary ions, the distance from the surface to the analyzing mass spectrometer system was kept as short as possible and the acceptance angle of the lens system as large as possible. This increased the sensitivity five orders of magnitude compared to its predecessor. The rigorous use of computer aided design software is responsible for the successful commissioning of the new device. This article describes first which parameters can be measured or controlled. Then, these are linked to the physical processes that occur in reactive ion–surface interactions. Next, the design goal and the design implementation are presented. In the end, a performance comparison, measurements of hydrogen surface chemistry with extensive use of isotope labeling, and measurements of post-ionized beryllium are presented.

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Reactive collisions involving the BeH molecular system

Cited by 2 publications

References 11 publications

Theoretical resonant electron-impact vibrational excitation, dissociative recombination and dissociative excitation cross sections of ro-vibrationally excited BeH⁺ ion

Theoretical resonant electron-impact vibrational excitation, dissociative recombination and dissociative excitation cross sections of ro-vibrationally excited BeH⁺ ion

A high sensitivity, high resolution tandem mass spectrometer to research low-energy, reactive ion–surface interactions

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Reactive collisions involving the BeH molecular system

Cited by 2 publications

References 11 publications

Theoretical resonant electron-impact vibrational excitation, dissociative recombination and dissociative excitation cross sections of ro-vibrationally excited BeH+ ion

Theoretical resonant electron-impact vibrational excitation, dissociative recombination and dissociative excitation cross sections of ro-vibrationally excited BeH+ ion

A high sensitivity, high resolution tandem mass spectrometer to research low-energy, reactive ion–surface interactions

Contact Info

Product

Resources

About

Theoretical resonant electron-impact vibrational excitation, dissociative recombination and dissociative excitation cross sections of ro-vibrationally excited BeH⁺ ion

Theoretical resonant electron-impact vibrational excitation, dissociative recombination and dissociative excitation cross sections of ro-vibrationally excited BeH⁺ ion