金属铜中 X 射线双光子吸收的非线性光谱学。

Nonlinear Spectroscopy with X-Ray Two-Photon Absorption in Metallic Copper.

机构信息

RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan.

Institute for Molecular Science, 38 Nishigo-Naka, Myodaiji, Okazaki-shi, Nagoya 444-8585, Japan.

出版信息

Phys Rev Lett. 2018 Aug 24;121(8):083901. doi: 10.1103/PhysRevLett.121.083901.

DOI:10.1103/PhysRevLett.121.083901

PMID:30192600

Abstract

X-ray two-photon absorption (TPA) spectrum of metallic copper is measured using a free-electron laser (XFEL). The spectrum differs from that measured by the conventional one-photon absorption (OPA), and characterized by a peak below the Fermi level, which is assigned to the transition to the 3d state. The impact of the XFEL pulse on the OPA spectrum is discussed by analyzing the pulse-energy dependence, which indicates that the intrinsic TPA spectrum is measured.

摘要

利用自由电子激光（XFEL）测量了金属铜的 X 射线双光子吸收（TPA）光谱。该光谱与传统的单光子吸收（OPA）测量的光谱不同，其特征在于费米能级以下的峰，该峰被分配到 3d 态的跃迁。通过分析脉冲能量依赖性来讨论 XFEL 脉冲对 OPA 光谱的影响，这表明测量了固有 TPA 光谱。