M. Möller,
F. Meyer,
A. M. Sayler,
G.G. Paulus,
M. F. Kling,
B. E. Schmidt,
W. Becker,
and D. B. Milošević
Off-axis low-energy structures in above-threshold ionization
Phys. Rev. A, 90 :023412 (August 2014)
Off-axis low-energy structures in above-threshold ionization
Phys. Rev. A, 90 :023412 (August 2014)
Abstract:
The velocity map of the above-threshold ionization electron spectrum at long laser wavelength exhibits a characteristic structure normal to the laser polarization, which has the appearance of a trident or a three-pronged fork. The forklike structure vanishes for few-cycle laser pulses. It is explained in terms of the classical-electron-trajectories model of strong-field ionization augmented so as to allow for rescattering. The analysis reveals its relation to the so-called low-energy structure, which was recently observed for very small transverse momenta.