用于X射线吸收光谱的桌面式光源，光子能量高达350电子伏特。

Table-top source for x-ray absorption spectroscopy with photon energies up to 350 eV.

作者信息

Naranjo-Montoya O A, Bridger M, Bhar R, Kalkhoff L, Schleberger M, Wende H, Tarasevitch A, Bovensiepen U

机构信息

Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Lotharstrasse 1, 47057 Duisburg, Germany.

出版信息

Rev Sci Instrum. 2024 Oct 1;95(10). doi: 10.1063/5.0219921.

DOI:10.1063/5.0219921

PMID:39356188

Abstract

We present a table-top setup for x-ray absorption spectroscopy (XAS) based on high harmonic generation (HHG) in noble gases. Using sub-millijoule pump pulses at a central wavelength of 1550 nm, broadband HHG in the range of 70-350 eV was demonstrated. The HHG coherence lengths of several millimeters were achieved by reaching the nonadiabatic regime of harmonic generation. Near edge x-ray absorption fine structure spectroscopy experiments on the boron K edge of a boron foil and a hexagonal boron nitride (hBN) 2D material demonstrate the capabilities of the setup. Femtosecond pulse duration makes pump-probe XAS experiments with corresponding time resolution possible.

摘要

我们展示了一种基于稀有气体高次谐波产生（HHG）的用于X射线吸收光谱（XAS）的桌面装置。使用中心波长为1550 nm的亚毫焦耳泵浦脉冲，实现了70 - 350 eV范围内的宽带高次谐波产生。通过达到谐波产生的非绝热区域，实现了几毫米的高次谐波产生相干长度。在硼箔和六方氮化硼（hBN）二维材料的硼K边进行的近边X射线吸收精细结构光谱实验证明了该装置的能力。飞秒脉冲持续时间使得具有相应时间分辨率的泵浦 - 探测XAS实验成为可能。