Electron Vortices in Femtosecond Multiphoton Ionization

被引：144

作者：

Pengel, D. ^{[1
]}

Kerbstadt, S. ^{[1
]}

Johannmeyer, D. ^{[1
]}

Englert, L. ^{[1
]}

Bayer, T. ^{[1
]}

Wollenhaupt, M. ^{[1
]}

机构：

[1] Carl von Ossietzky Univ Oldenburg, Inst Phys, Carl von Ossietzky Str 9-11, D-26129 Oldenburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 05期

关键词：

PHOTOELECTRON ANGULAR-DISTRIBUTIONS; WAVE-PACKETS;

D O I：

10.1103/PhysRevLett.118.053003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Multiphoton ionization of potassium atoms with a sequence of two counter-rotating circularly polarized femtosecond laser pulses produces vortex-shaped photoelectron momentum distributions in the polarization plane describing Archimedean spirals. The pulse sequences are produced by polarization shaping and the three-dimensional photoelectron distributions are tomographically reconstructed from velocity map imaging measurements. We show that perturbative ionization leads to electron vortices with c(6) rotational symmetry. A change from c(6) to c(4) rotational symmetry of the vortices is demonstrated for nonperturbative interaction.

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页数：5

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