Laser-Assisted Electron Scattering and Diffraction in Ultrashort Intense Laser Fields

Potential electron scattering by atoms immersed in a laser field is investigated in the case where the laser beam presents a strong transverse macroscopic inhomogeneity, due, for instance, to the need of focusing the laser beam. A reasonable model of inhomogeneity is introduced to study the important case where an isolated Feshbach resonance exists. The nonresonant scattering process with a net number N of photons absorbed or emitted is also studied. In a weak field, the inhomogeneity results in the enhancement of the N = 0 process to the detriment of the others; in addition the probability of the N ≠ 0 process decreases when [Formula: see text] increases. The decline is more pronounced in a weak inhomogeneous field than in an homogeneous field whose strength is the central strength of the inhomogeneous field. In intense laser fields the situation depends on the value of the field.Similar conclusions are drawn when only the Feshbach resonance is observed. In that case it is shown that a strong inhomogeneity could be an advantage if intense enough central laser fields may be achieved. It could be of help in the search of Feshbach resonances in electron–atom collisions at energies below the first excitation threshold.It is worthwhile to note that our treatment may be used without change in the case of a macroscopic laser field inhomogeneity in time.

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Apparatus for laser-assisted electron scattering in femtosecond intense laser fields

Review of Scientific Instruments ◽

10.1063/1.3665926 ◽

2011 ◽

Vol 82 (12) ◽

pp. 123105 ◽

Cited By ~ 16

Author(s):

Reika Kanya ◽

Yuya Morimoto ◽

Kaoru Yamanouchi

Keyword(s):

Electron Scattering ◽

Intense Laser ◽

Intense Laser Fields ◽

Laser Fields

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Development of an apparatus for femtosecond laser-assisted (e,2e) experiments

EPJ Web of Conferences ◽

10.1051/epjconf/201920503008 ◽

2019 ◽

Vol 205 ◽

pp. 03008

Author(s):

Takashi Hiroi ◽

Yuya Morimoto ◽

Reika Kanya ◽

Kaoru Yamanouchi

Keyword(s):

Femtosecond Laser ◽

Electron Scattering ◽

Time Of Flight ◽

Molecular Orbitals ◽

Intense Laser ◽

Intense Laser Fields ◽

Laser Fields ◽

Dual Angle

We developed an electron scattering apparatus equipped with dual angle-resolved time-of-flight analyzers designed for laser-assisted (e,2e) experiments, with which atomic and molecular orbitals influenced by intense laser fields can be investigated.

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Femtosecond Laser-Assisted Electron Scattering for Ultrafast Dynamics of Atoms and Molecules

Atoms ◽

10.3390/atoms7030085 ◽

2019 ◽

Vol 7 (3) ◽

pp. 85 ◽

Cited By ~ 2

Author(s):

Reika Kanya ◽

Kaoru Yamanouchi

Keyword(s):

Electron Diffraction ◽

Electron Scattering ◽

Experimental Studies ◽

Laser Pulses ◽

Intense Laser ◽

Intense Laser Fields ◽

Laser Fields ◽

Optical Gating ◽

Intense Laser Pulses ◽

New Concepts

The recent progress in experimental studies of laser-assisted electron scattering (LAES) induced by ultrashort intense laser fields is reviewed. After a brief survey of the theoretical backgrounds of the LAES process and earlier LAES experiments started in the 1970s, new concepts of optical gating and optical streaking for the LAES processes, which can be realized by LAES experiments using ultrashort intense laser pulses, are discussed. A new experimental setup designed for measurements of LAES induced by ultrashort intense laser fields is described. The experimental results of the energy spectra, angular distributions, and laser polarization dependence of the LAES signals are presented with the results of the numerical simulations. A light-dressing effect that appeared in the recorded LAES signals is also shown with the results of the numerical calculations. In addition, as applications of the LAES process, laser-assisted electron diffraction and THz-wave-assisted electron diffraction, both of which have been developed for the determination of instantaneous geometrical structure of molecules, are introduced.

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