Ultrafast Electron Diffraction Technology for Exploring Dynamics of Molecules

Jang, Kyu‐Ha; Oang, Key Young; Baek, In Hyung; Setiniyaz, Sadiq; Lee, Kitae; Jeong, Young Uk; Kim, Hyun Woo

doi:10.3938/jkps.73.466

Cited by 2 publications

(1 citation statement)

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“…Active drift stabilization by using THz streaking is implemented, which achieved 5.5 fs (rms) timing drift over 4600 s. The timing performance comparison of our UED system with other state‐of‐the‐art ones is provided in Table 1 . [ 53–61 ] With a higher bunch repetition rate of the electron beam in near future, the impact of timing drift will be much smaller due to shorter measurement time. This timing stabilization scheme is able to operate UED systems with sub‐10 fs timing drift over an hour.…”

Section: Resultsmentioning

confidence: 99%

Sub‐10‐fs Timing for Ultrafast Electron Diffraction with THz‐Driven Streak Camera

Shin

Kim

Baek

et al. 2020

Laser & Photonics Reviews

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Ultrafast electron diffraction (UED) has evolved to be a powerful tool for the study of structural dynamics with subpicosecond temporal resolution and subatomic spatial resolution. Recently, there have been intense research efforts toward femtosecond timing jitter and stability for improving the temporal resolution of UEDs, however, so far there has been no work showing long‐term (e.g., >1 h) stable timing for MeV‐level UED systems. In this article, a comprehensive timing synchronization method, based on optical‐radiofrequency synchronization and THz streaking, is demonstrated to maintain sub‐10‐fs long‐term timing stability for radiofrequency‐gun‐based MeV‐level UED, which results in 5.5 fs root‐mean‐square timing drift maintained over 4600 s. With high electron energy and low timing drift, the demonstrated capability is an important step toward studying ultrafast phenomena in samples with low scattering power, such as volatile gases and 2D materials.

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Section: Resultsmentioning

confidence: 99%