Molecular Orbital Imaging of Excited States Using Time-Resolved (e, 2e) Electron Momentum Spectroscopy

Yamazaki, Masakazu; Oishi, Keiya; Nakazawa, Hiroyuki; Tang, Yuchao; Zhu, Chaoyuan; Takahashi, Masahiko

doi:10.1364/up.2016.uth4a.4

Cited by 4 publications

(5 citation statements)

References 11 publications

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“…• EMS experiments on laser-excited targets, which have been performed only for the three targets, the Na atom [56] and the acetone [57] and toluene molecules.…”

Section: Masakazu Yamazaki and Masahiko Takahashimentioning

confidence: 99%

“…Great progress has been made in this field over the past 50 years and today there are more sophisticated researches underway than ever before. One sign of such constant challenges is development of time-resolved EMS (TR-EMS) [51,57], which is an experimental technique that employs short-pulsed laser and electron pulses in a pumpprobe scheme. It has very recently made it possible to conduct EMS measurements for short-lived molecules in their excited states with lifetimes of several to tens of picoseconds [57].…”

Section: Masakazu Yamazaki and Masahiko Takahashimentioning

confidence: 99%

“…One of such spectroscopic complexes desired is a set of TR-EMS and time-resolved version of atomic momentum spectroscopy (AMS) that is based on electron-atom Compton scattering [58,59]. A more advanced use of the current TR-EMS technique [57] will make it possible to measure in real time the momentum distributions of each electron, bound in a transient, evolving system, with different ionization energies, thereby enabling one to make a 'MO movie' in p-space. The observed change in electron motion would represent the driving force behind chemical reaction.…”

Section: Masakazu Yamazaki and Masahiko Takahashimentioning

confidence: 99%

See 2 more Smart Citations

Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions

Schippers

Sokell

Aumayr

et al. 2019

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

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We publish three Roadmaps on photonic, electronic and atomic collision physics in order to celebrate the 60th anniversary of the ICPEAC conference. In Roadmap II we focus on electron and antimatter interactions. Modern theoretical and experimental approaches provide detailed insight into the many body quantum dynamics of leptonic collisions with targets of varying complexity ranging from neutral and charged atoms to large biomolecules and clusters. These developments have been driven by technological progress and by the needs of adjacent areas of science such as astrophysics, plasma physics and radiation biophysics. This Roadmap aims at looking back along the road, explaining the evolution of the field, and looking forward, collecting contributions from eighteen leading groups from the field.

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“…• EMS experiments on laser-excited targets, which have been performed only for the three targets, the Na atom [56] and the acetone [57] and toluene molecules.…”

Section: Masakazu Yamazaki and Masahiko Takahashimentioning

confidence: 99%

Section: Masakazu Yamazaki and Masahiko Takahashimentioning

confidence: 99%

Section: Masakazu Yamazaki and Masahiko Takahashimentioning

confidence: 99%

See 1 more Smart Citation

Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions

Schippers

Sokell

Aumayr

et al. 2019

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

View full text Add to dashboard Cite

show abstract

“…Recent advances in electron sources have lead to ultrafast time-resolved electron scattering experiments [29,30], however direct time-resolved studies of a transient metastable anion formed by electron attachment remain experimentally intractable due the very short timescales of single molecule dissociation that demand even higher time resolution. Considerable technical challenges remain that must be overcome to produce and transport low energy electrons with a pulse duration less than ∼100fs [29][30][31][32]. On the other hand, the experimental approaches that interrogate the final states following DEA can lend much insight into these dynamics.…”

Section: Experimental Techniquesmentioning

confidence: 99%

Ion-momentum imaging of dissociative attachment of electrons to molecules

Slaughter¹,

Belkacem²,

McCurdy³

et al. 2016

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

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We present an overview of experiments and theory relevant to dissociative electron attachment studied by momentum imaging. We describe several key examples of characteristic transient anion dynamics in the form of small polyatomic electron-molecule systems. In each of these examples the socalled axial recoil approximation is found to break down due to correlation of the electronic and nuclear degrees of freedom of the transient anion. Guided by anion fragment momentum measurements and predictions of the electron scattering attachment probability in the molecular frame, we demonstrate that accurate predictions of the dissociation dynamics can be achieved without a detailed investigation of the surface topology of the relevant electronic states or the fragment trajectories on those surfaces.

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“…Moreover, owing to the sensitivity of valence electrons to the structure of a molecule, EMS can detect and study modifications of electron momentum densities due to molecular conformation changes [37], molecular pseudorotations [38], multicenter effects [39,40], or vibrations [41,42]. Recently, (e,2e) measurements have been carried out for excited molecular states [43,44]. Recent theoretical advances include analyses and simulations of laser-assisted EMS processes [45] as well as of time-resolved EMS for electronic motions in atoms and molecules [46].…”

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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Molecular Orbital Imaging of Excited States Using Time-Resolved (e, 2e) Electron Momentum Spectroscopy

Cited by 4 publications

References 11 publications

Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions

Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions

Ion-momentum imaging of dissociative attachment of electrons to molecules

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

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