荧光强度相关成像与高空间分辨率和元素对比度使用强x射线脉冲。

IF 2.3 2区 物理与天体物理 Q3 CHEMISTRY, PHYSICAL
Structural Dynamics-Us Pub Date : 2021-07-29 eCollection Date: 2021-07-01 DOI:10.1063/4.0000105
Phay J Ho, Christopher Knight, Linda Young
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引用次数: 3

摘要

我们从理论上研究了Ar团簇和掺杂mo的氧化铁纳米颗粒在强、飞秒和亚飞秒x射线自由电子激光脉冲下的荧光强度相关性(FIC),用于高分辨率和元素对比成像。我们提出了Ar团簇中K α和K α h发射的FIC,讨论了样品损伤对获取高分辨率结构信息的影响,并将获得的结构信息与相干衍射成像(CDI)方法的结构信息进行了比较。我们发现,虽然亚飞秒脉冲将大大有利于CDI方法,但较少的飞秒脉冲可能足以通过FIC获得高分辨率信息。此外,我们证明了从Mo掺杂氧化铁纳米颗粒中Mo原子的荧光计算的荧光强度相关性可以用于成像非谐振区的掺杂分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Fluorescence intensity correlation imaging with high spatial resolution and elemental contrast using intense x-ray pulses.

Fluorescence intensity correlation imaging with high spatial resolution and elemental contrast using intense x-ray pulses.

Fluorescence intensity correlation imaging with high spatial resolution and elemental contrast using intense x-ray pulses.

Fluorescence intensity correlation imaging with high spatial resolution and elemental contrast using intense x-ray pulses.

We theoretically investigate the fluorescence intensity correlation (FIC) of Ar clusters and Mo-doped iron oxide nanoparticles subjected to intense, femtosecond, and sub-femtosecond x-ray free-electron laser pulses for high-resolution and elemental contrast imaging. We present the FIC of K α and K α h emission in Ar clusters and discuss the impact of sample damage on retrieving high-resolution structural information and compare the obtained structural information with those from the coherent diffractive imaging (CDI) approach. We found that, while sub-femtosecond pulses will substantially benefit the CDI approach, few-femtosecond pulses may be sufficient for achieving high-resolution information with the FIC. Furthermore, we show that the fluorescence intensity correlation computed from the fluorescence of the Mo atoms in Mo-doped iron oxide nanoparticles can be used to image dopant distributions in the nonresonant regime.

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来源期刊
Structural Dynamics-Us
Structural Dynamics-Us CHEMISTRY, PHYSICALPHYSICS, ATOMIC, MOLECU-PHYSICS, ATOMIC, MOLECULAR & CHEMICAL
CiteScore
5.50
自引率
3.60%
发文量
24
审稿时长
16 weeks
期刊介绍: Structural Dynamics focuses on the recent developments in experimental and theoretical methods and techniques that allow a visualization of the electronic and geometric structural changes in real time of chemical, biological, and condensed-matter systems. The community of scientists and engineers working on structural dynamics in such diverse systems often use similar instrumentation and methods. The journal welcomes articles dealing with fundamental problems of electronic and structural dynamics that are tackled by new methods, such as: Time-resolved X-ray and electron diffraction and scattering, Coherent diffractive imaging, Time-resolved X-ray spectroscopies (absorption, emission, resonant inelastic scattering, etc.), Time-resolved electron energy loss spectroscopy (EELS) and electron microscopy, Time-resolved photoelectron spectroscopies (UPS, XPS, ARPES, etc.), Multidimensional spectroscopies in the infrared, the visible and the ultraviolet, Nonlinear spectroscopies in the VUV, the soft and the hard X-ray domains, Theory and computational methods and algorithms for the analysis and description of structuraldynamics and their associated experimental signals. These new methods are enabled by new instrumentation, such as: X-ray free electron lasers, which provide flux, coherence, and time resolution, New sources of ultrashort electron pulses, New sources of ultrashort vacuum ultraviolet (VUV) to hard X-ray pulses, such as high-harmonic generation (HHG) sources or plasma-based sources, New sources of ultrashort infrared and terahertz (THz) radiation, New detectors for X-rays and electrons, New sample handling and delivery schemes, New computational capabilities.
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