44电子伏特自由电子激光辐射作用下氦气和氖气双光子双电离的反冲离子动量分布

Recoil-ion momentum distributions for two-photon double ionization of He and Ne by 44 eV free-electron laser radiation.

作者信息

Rudenko A, Foucar L, Kurka M, Ergler Th, Kühnel K U, Jiang Y H, Voitkiv A, Najjari B, Kheifets A, Lüdemann S, Havermeier T, Smolarski M, Schössler S, Cole K, Schöffler M, Dörner R, Düsterer S, Li W, Keitel B, Treusch R, Gensch M, Schröter C D, Moshammer R, Ullrich J

机构信息

Max-Planck Advanced Study Group at CFEL, Notkestrasse 85, 22607 Hamburg, Germany.

出版信息

Phys Rev Lett. 2008 Aug 15;101(7):073003. doi: 10.1103/PhysRevLett.101.073003.

DOI:10.1103/PhysRevLett.101.073003

PMID:18764529

Abstract

Recoil-ion momentum distributions for two-photon double ionization of He and Ne (variant Planck's over omega=44 eV) have been recorded with a reaction microscope at FLASH (the free-electron laser at Hamburg) at an intensity of approximately 1 x 10(14) W/cm2 exploring the dynamics of the two fundamental two-photon-two-electron reaction pathways, namely, sequential and direct (or nonsequential) absorption of the photons. We find strong differences in the recoil-ion momentum patterns for the two mechanisms pointing to the significantly different two-electron emission dynamics and thus provide serious constraints for theoretical models.

摘要

利用反应显微镜在汉堡的自由电子激光装置FLASH上，以约1×10¹⁴ W/cm²的强度记录了氦和氖双光子双电离的反冲离子动量分布（普朗克常量与角频率之比为44 eV的变体），探索了两种基本的双光子双电子反应路径的动力学，即光子的顺序吸收和直接（或非顺序）吸收。我们发现这两种机制的反冲离子动量模式存在显著差异，这表明双电子发射动力学有很大不同，从而为理论模型提供了严格限制。