Doubly differential cross sections of secondary electrons ejected from gases by electron impact: 50-300 eV on helium

Shyn, T. W.; Sharp, William

doi:10.1103/physreva.19.557

Cited by 65 publications

(43 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 2 shows the DDCS results of He. The DDCS results are found to be in good agreement with the experimental data of Sharp et al [2] for 55 eV impact and 10 eV ejected energy.…”

Section: Resultssupporting

confidence: 81%

Measurements of Double Differential Cross-Sections for He at Intermediate Energy

et al. 2014

View full text Add to dashboard Cite

Detailed studies on ionization of atoms and molecules by electron impact have made numerous contributions to understanding of the structure of atoms and molecules including the interaction between particles. After a ionizing collision a scattered electron, an ejected electron and a recoil ion is formed. Doubly dierential cross-sections give detailed information for one of the outgoing electrons. In this study, we report the angular distribution of double dierential cross-sections of ejected electrons from He in intermediate energy region.

show abstract

“…Figure 2 shows the DDCS results of He. The DDCS results are found to be in good agreement with the experimental data of Sharp et al [2] for 55 eV impact and 10 eV ejected energy.…”

Section: Resultssupporting

confidence: 81%

Measurements of Double Differential Cross-Sections for He at Intermediate Energy

et al. 2014

View full text Add to dashboard Cite

show abstract

“…In the past, several groups of experimentalists, namely Opal et al [1,2], Oda et al [3,4], Rudd et al [5,6], Shyn et al [7][8][9][10][11], Goruganthu et al [ 12] and Mfiller-Fiedler et al [13] obtained results for DDCS mainly for helium atom, because of the simple reason that it is the simplest atom for which experimental difficulties can be minimized. Unfortunately the results of the experiments of one group usually differ widely from those of other groups (see [14]).…”

Section: Introductionmentioning

confidence: 99%

Multiple scattering calculation of double and single differential cross sections for ionization of hydrogen atoms by electrons at intermediate energies

Das

Seal

1994

Z Phys D - Atoms, Molecules and Clusters

View full text Add to dashboard Cite

Abstract. The multiple scattering approach of Das and Seal, which was applied earlier to calculate the triple differential cross section for the ionization of atomic hydrogen by electrons is now used to calculate the double and the single differential cross sections for the same system. The range of the incident electron energy is taken to be 100-250 eV. The present results are compared with the measured results of Shyn and with the available distorted wave Born approximation results.

show abstract

“…Here, however, we are interested in maximizing the cross-section for generating low energy secondary electrons rather than the total ionization cross section. In fact, since the threshold ionization for helium is ∼ 24.58 eV, it is not surprising that the low energy cross-section peaks at E p ∼ 30 eV [100,101]. The incoming electron energy should therefore be set to around 30 eV, resulting in an optimal cross section of σ ion ∼ 0.05Å 2 for secondary electrons with energy below 1 eV [100].…”

Section: Low Energy Electron Sourcementioning

confidence: 99%

Hybrid quantum systems with trapped charged particles

2017

View full text Add to dashboard Cite

Trapped charged particles have been at the forefront of quantum information processing (QIP) for a few decades now, with deterministic two-qubit logic gates reaching record fidelities of 99.9% and single qubit operations of much higher fidelity. In a hybrid system involving trapped charges, quantum degrees of freedom of macroscopic objects such as bulk acoustic resonators, superconducting circuits or nano-mechanical membranes, couple to the trapped charges and ideally inherit the coherent properties of the charges. The hybrid system therefore implements a "quantum transducer", where the quantum reality (i.e. superpositions and entanglement) of small objects is extended to include the larger object. Although a hybrid quantum system with trapped charges could be valuable both for fundamental research and for QIP application, no such system exists today. Here we study theoretically the possibilities of coupling the quantum mechanical motion of a trapped charged particle (e.g. ion or electron) to quantum degrees of freedom of superconducting devices, nano-mechanical resonators and quartz bulk acoustic wave resonators. For each case, we estimate the coupling rate between the charged particle and its macroscopic counterpart and compare it to the decoherence rate, i.e. the rate at which quantum superposition decays. A hybrid system can only be considered quantum if the coupling rate significantly exceeds all decoherence rates. Our approach is to examine specific examples, using parameters that are experimentally attainable in the foreseeable future. We conclude that those hybrid quantum system considered involving an atomic ion are unfavorable, compared to using an electron, since the coupling rates between the charged particle and its counterpart are slower than the expected decoherence rates. A system based on trapped electrons, on the other hand, might have coupling rates which significantly exceed decoherence rates. Moreover it might have appealing properties such as fast entangling gates, long coherence and flexible electron interconnectivity topology. Realizing such a system, however, is technologically challenging, since it requires accommodating both trapping technology and superconducting circuitry in a compatible manner. We review some of the challenges involved, such as the required trap parameters, electron sources, electrical circuitry and cooling schemes in order to promote further investigations towards the realization of such a hybrid system. CONTENTS

show abstract

Doubly differential cross sections of secondary electrons ejected from gases by electron impact: 50-300 eV on helium

Cited by 65 publications

References 17 publications

Measurements of Double Differential Cross-Sections for He at Intermediate Energy

Measurements of Double Differential Cross-Sections for He at Intermediate Energy

Multiple scattering calculation of double and single differential cross sections for ionization of hydrogen atoms by electrons at intermediate energies

Hybrid quantum systems with trapped charged particles

Contact Info

Product

Resources

About