Fast-electron scattering from Ne: A comparison of distorted-wave theory with experiment

McEachran, R P; Vos, Maarten; Zhu, Lin-Fan

doi:10.1103/physreva.87.052703

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…There are some complications in the calculation of the intensities for the monopole transitions where the excited state wavefunction has the same angular momentum quantum numbers (J = M = 0) as the ground state as explained in [16]. In these cases, the ground and excited state wavefunctions will not be automatically orthogonal if they are obtained in separate MCDF calculations.…”

Section: Resultsmentioning

confidence: 99%

“…Such intensity was reproduced successfully by the relativistic distorted wave (RDW) theory (which goes beyond the FBA) which for Ar and Ne gave quite a good quantitative description for the intensity of the resonant transitions [15], even at very high momentum transfer (up to ≈ 20 au). For Ne the RDW theory was used to simulate the spectra up to the onset of the continuum, and the level of agreement was mixed; in particular the quantitative description of the monopole transitions presents a significant challenge [16]. In this paper we want to study the case of Ar in a similar way using both high energy resolution measurements at low and intermediate momentum transfer and lower energy resolution measurements at higher momentum transfer.…”

Section: Introductionmentioning

confidence: 99%

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A comparison of the theoretical and experimental results for keV electron scattering from argon

Vos

McEachran

Zhu

2014

J. Phys. B: At. Mol. Opt. Phys.

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Experiments studying the scattering of keV electrons from noble gas atoms have been performed in the past, as the first Born approximation (FBA) was thought to be valid under these conditions, and hence it was expected that these experiments could be modelled relatively straightforwardly by theory. Somewhat surprisingly these experiments have so far attracted only very limited theoretical interest and the ability of modern scattering theory to describe them has not been firmly established. In our earlier study of the cross section for the resonant transitions, we established that the FBA was sufficient to describe the results for small scattering angles, but it did not account for the observed intensity at larger angles. Here we extend this comparison for the case of argon to monopole, quadrupole and octopole transitions below the continuum. The experimental results show differential cross sections spanning many orders of magnitude for these transitions. The relativistic distorted wave theory developed here describes these experiments for many transitions and a large range of scattering angles reasonably well.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comparison of the theoretical and experimental results for keV electron scattering from argon

Vos

McEachran

Zhu

2014

J. Phys. B: At. Mol. Opt. Phys.

Self Cite

View full text Add to dashboard Cite

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Revisiting the oscillator strengths and cross sections of atomic neon by fast electron scattering

Wang

Sun

et al. 2022

Journal of Quantitative Spectroscopy and Radiative Transfer

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Improving the mesoscopic modeling of DNA denaturation dynamics

Marty-Roda¹,

Dahlen

Erp

et al. 2018

Phys. Biol.

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Although previously developed mesoscopic DNA models have successfully reproduced thermodynamic denaturation data, recent studies show that these overestimate the rate of denaturation by orders of magnitude. Using adapted Peyrard-Bishop-Dauxois (PBD) models, we have calculated the denaturation rates of several DNA hairpins and made comparison with experimental data. We show that the addition of a barrier at the onsite potential of the PBD model gives a more accurate description of the unzipping dynamics of short DNA sequences. The new models provide a refined theoretical insight on the dynamical mechanisms of unzipping which can have implications for the understanding of transcription and replication processes. Still, this class of adapted PBD models seems to have a fundamental limitation which implies that it is not possible to get agreement with available experimental results on the dynamics of long DNA sequences and at the same time maintain the good agreement regarding its thermodynamics. The reason for this is that the denaturation rate of long DNA chains is not dramatically lowered by the additional barrier-as the base-pairs that open are more likely to remain open, facilitating the opening of the full DNA molecule. Some care has to be taken, since experimental techniques suitable to the study of denaturation rates of long sequences seem not to agree with other experimental data on short DNA sequences. Further research, both theoretical and experimental, is therefore needed to resolve these inconsistencies-which will be a starting point for new minimalistic models that are able to describe both thermodynamics and dynamics at a predictive level.

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Fast-electron scattering from Ne: A comparison of distorted-wave theory with experiment

Cited by 4 publications

References 25 publications

A comparison of the theoretical and experimental results for keV electron scattering from argon

A comparison of the theoretical and experimental results for keV electron scattering from argon

Revisiting the oscillator strengths and cross sections of atomic neon by fast electron scattering

Improving the mesoscopic modeling of DNA denaturation dynamics

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