期刊
QUANTUM BEAM SCIENCE
卷 4, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/qubs4010004
关键词
ultrafast electron diffraction; relativistic electron pulse; femtosecond; single shot imaging; time-resolved; single crystals; polycrystals; amorphous; structural dynamics
类别
资金
- JSPS KAKENHI [JP22246127, JP26246026, JP17H01060, JP16K13687]
We have developed a compact relativistic femtosecond electron diffractometer with a radio-frequency photocathode electron gun and an electron lens system. The electron gun generated 2.5-MeV-energy electron pulses with a duration of 55 +/- 5 fs containing 6.3 x 10(4) electrons per pulse. Using these pulses, we successfully detected high-contrast electron diffraction images of single crystalline, polycrystalline, and amorphous materials. An excellent spatial resolution of diffraction images was obtained as 0.027 +/- 0.001 angstrom(-1). In the time-resolved electron diffraction measurement, a laser-excited ultrafast electronically driven phase transition in single-crystalline silicon was observed with a temporal resolution of 100 fs. The results demonstrate the advantages of the compact relativistic femtosecond electron diffractometer, including access to high-order Bragg reflections, single shot imaging with the relativistic femtosecond electron pulse, and the feasibility of time-resolved electron diffraction to study ultrafast structural dynamics.
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