Electron momentum spectroscopy of atoms and molecules

McCarthy, Ian E.; Weigold, E.

doi:10.1088/0034-4885/54/6/001

Cited by 507 publications

(370 citation statements)

References 138 publications

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“…Indeed, unlike other fields with strong correlations effects, like particle or condensed matter physics, it is now possible in nuclear physics to state that the properties of the constituent protons inside the nucleus are identified experimentally and understood in global terms theoretically. For atoms and molecules it is also possible to extract this kind of information by employing the corresponding (e,2e) reaction [275,276]. This reaction generates the best possible information on the properties of individual electrons in these systems.…”

Section: Recent Experimental Data At Higher Missing Energiesmentioning

confidence: 99%

Self-consistent Green's function method for nuclei and nuclear matter

Dickhoff

Barbieri

2004

Progress in Particle and Nuclear Physics

494

599

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Recent results obtained by applying the method of self-consistent Green's functions to nuclei and nuclear matter are reviewed. Particular attention is given to the description of experimental data obtained from the (e,e ′ p) and (e,e ′ 2N) reactions that determine one and two-nucleon removal probabilities in nuclei since the corresponding amplitudes are directly related to the imaginary parts of the single-particle and two-particle propagators. For this reason and the fact that these amplitudes can now be calculated with the inclusion of all the relevant physical processes, it is useful to explore the efficacy of the method of self-consistent Green's functions in describing these experimental data. Results for both finite nuclei and nuclear matter are discussed with particular emphasis on clarifying the role of short-range correlations in determining various experimental quantities. The important role of long-range correlations in determining the structure of lowenergy correlations is also documented. For a complete understanding of nuclear phenomena it is therefore essential to include both types of physical correlations. We demonstrate that recent experimental results for these reactions combined with the reported theoretical calculations yield a very clear understanding of the properties of all protons in the nucleus. We propose that this knowledge of the properties of constituent fermions in a correlated many-body system is a unique feature of nuclear physics.

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Section: Recent Experimental Data At Higher Missing Energiesmentioning

confidence: 99%

Self-consistent Green's function method for nuclei and nuclear matter

Dickhoff

Barbieri

2004

Progress in Particle and Nuclear Physics

494

599

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“…The basic principle of EMS [48][49][50]64] is an ionization plus electron scattering process initiated by electron collision, i.e. a so-called (e, 2e) reaction.…”

Section: Theoretical Background For Ionization Phenomena and Electronmentioning

confidence: 99%

“…Note that the above equations (2) and (3) provide a formally exact depiction of (e, 2e) cross sections in the high-energy limit (E 0 >> 1 keV) ensuring the so-called EMS conditions [48,49,64,50] As EMS, one-particle Green's Function (1p-GF) theory [52] enables a direct mapping, and this within an exact many-body framework, of vertical ionization energies and Dyson orbitals.…”

Section: Theoretical Background For Ionization Phenomena and Electronmentioning

confidence: 99%

“…In a first study at Tsinghua University [47] employing Electron Momentum Spectroscopy (EMS) [48][49][50], the experimentally inferred electronic structure of cyclopentane was assigned from an analysis of the angular dependence of electron-impact (e, 2e) ionization intensities by comparison with theoretical spherically averaged electron momentum distributions that were empirically derived from standard (B3LYP) Kohn-Sham orbitals. It is here worth reminding again that EMS is particularly sensitive to the low momentum (large r) part of the outermost orbital densities that are important in molecular recognition processes and at the early stages of a cyclo-addition reaction.…”

Section: Introductionmentioning

confidence: 99%

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Study of the photoelectron and electron momentum spectra of cyclopentene using benchmark Dyson orbital theories

Huang

Ning

Deng

et al. 2008

Phys. Chem. Chem. Phys.

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Abstract:A complete study of the valence electronic structure and related electronic excitation properties of cyclopentene in its C s ground state geometry is presented. Ionization spectra obtained from this compound by means of photoelectron spectroscopy (He I and He II) and Electron Momentum Spectroscopy have been analyzed in details up to electron binding energies of 30 eV using one-particle Green's function (1p-GF) theory along with the outer-valence (OVGF) and the third-order algebraic diagrammatic construction [ADC(3)] schemes. The employed geometries derive from DFT/B3LYP calculations in conjunction with the aug-cc-pVTZ basis set, and closely approach the structures inferred from experiments employing microwave spectroscopy or electron diffraction in the gas phase. The 1p-GF/ADC (3) calculations indicate that the orbital picture of ionization breaks down at binding energies larger 2 than ~17 eV in the inner-valence region, and that the outer-valence 7a′ orbital is also subject to a significant dispersion of the ionization intensity over shake-up states. This study confirms further the rule that OVGF pole strengths smaller than 0.85 foretell a breakdown of the orbital picture of ionization at the ADC(3) level. Spherically averaged (e, 2e) electron momentum distributions at an electron impact energy of 1200 eV that were experimentally inferred from an angular analysis of EMS intensities have been interpreted by comparison with accurate simulations employing ADC(3) Dyson orbitals. Very significant discrepancies were observed with momentum distributions obtained from several outer-valence ionization bands using standard Kohn-Sham orbitals.

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“…Electron momentum spectroscopy (EMS) provides a different probe scheme that images electronic states in momentum space [24][25][26][27][28]. It thus provides a distinct yet complementary perspective on electron dynamics.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved electron(e,2e)momentum spectroscopy: Application to laser-driven electron population transfer in atoms

Shao

Starace

2018

Phys. Rev. A

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Owing to its ability to provide unique information on electron dynamics, time-resolved electron momentum spectroscopy (EMS) is used to study theoretically a laser-driven electronic motion in atoms. Specifically, a chirped laser pulse is used to adiabatically transfer the populations of lithium atoms from the ground state to the first excited state. During this process, impact ionization near the Bethe ridge by time-delayed ultrashort, high-energy electron pulses is used to image the instantaneous momentum density of this electronic population transfer. Simulations with 100 fs and 1 fs pulse durations demonstrate the capability of EMS to image the time-varying momentum density, including its change of symmetry as the population transfer progresses. Moreover, the spectra corresponding to different pulse durations reveal different kinds of electronic motion. We discuss how to properly interpret these time-resolved EMS spectra, which represent a generalization of time-independent EMS.

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Electron momentum spectroscopy of atoms and molecules

Cited by 507 publications

References 138 publications

Self-consistent Green's function method for nuclei and nuclear matter

Self-consistent Green's function method for nuclei and nuclear matter

Study of the photoelectron and electron momentum spectra of cyclopentene using benchmark Dyson orbital theories

Time-resolved electron(e,2e)momentum spectroscopy: Application to laser-driven electron population transfer in atoms

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