Noninvasive time-sorting in radio frequency-compressed ultrafast electron diffraction.

IF 2.3 2区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Structural Dynamics-Us Pub Date : 2021-07-23 eCollection Date: 2021-07-01 DOI:10.1063/4.0000113

Lingrong Zhao, Jun Wu, Zhe Wang, Heng Tang, Xiao Zou, Tao Jiang, Pengfei Zhu, Dao Xiang, Jie Zhang

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引用次数: 0

Abstract

We demonstrate a noninvasive time-sorting method for ultrafast electron diffraction (UED) experiments with radio frequency (rf)-compressed electron beams. We show that electron beam energy and arrival time at the sample after the rf compression are strongly correlated, such that the arrival time jitter may be corrected through the measurement of the beam energy. The method requires minimal change to the infrastructure of most of the UED machines and is applicable to both keV and MeV UED. In our experiment with ∼3 MeV beam, the timing jitter after the rf compression is corrected with a 35-fs root mean square (rms) accuracy, limited by the $3 \times 10^{- 4}$ energy stability. For keV UED with a high energy stability, sub-10 fs accuracy in time-sorting should be readily achievable. This time-sorting technique allows us to retrieve the 2.5 THz oscillation related to coherent A_1g phonon in the laser-excited Bismuth film and extends the temporal resolution of UED to a regime far beyond the 100-200 fs rms jitter limitation.

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射频压缩超快电子衍射中的无创时间排序。

我们展示了使用射频压缩电子束进行超快电子衍射（UED）实验的非侵入式时间排序方法。我们的研究表明，射频压缩后的电子束能量和到达样品的时间密切相关，因此可以通过测量电子束能量来校正到达时间的抖动。这种方法只需对大多数超导电子设备的基础设施进行最小程度的改动，并且适用于 keV 和 MeV 超导电子设备。在我们使用 ∼3 MeV 光束的实验中，受限于 3 × 10 - 4 能量稳定性，射频压缩后的时间抖动校正精度为 35 fs 均方根（rms）。对于具有高能量稳定性的 keV UED，10 fs 以下的时间排序精度应该很容易实现。这种时间排序技术使我们能够检索与激光激发铋薄膜中相干 A1g 声子有关的 2.5 THz 振荡，并将 UED 的时间分辨率扩展到远远超出 100-200 fs 均方根抖动限制的范围。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structural Dynamics-Us CHEMISTRY, PHYSICALPHYSICS, ATOMIC, MOLECU-PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

CiteScore

5.50

自引率

3.60%

发文量

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.