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Precision-controlled ultrafast electron microscope platforms. A case study: Multiple-order coherent phonon dynamics in 1T-TaSe2 probed at 50 fs–10 fm scales.
- Source :
- Structural Dynamics; Mar2024, Vol. 11 Issue 2, p1-13, 13p
- Publication Year :
- 2024
-
Abstract
- We report on the first detailed beam tests attesting the fundamental principle behind the development of high-current-efficiency ultrafast electron microscope systems where a radio frequency (RF) cavity is incorporated as a condenser lens in the beam delivery system. To allow for the experiment to be carried out with a sufficient resolution to probe the performance at the emittance floor, a new cascade loop RF controller system is developed to reduce the RF noise floor. Temporal resolution at 50 fs in full-width-at-half-maximum and detection sensitivity better than 1% are demonstrated on exfoliated 1T-TaSe<subscript>2</subscript> system under a moderate repetition rate. To benchmark the performance, multi-terahertz edge-mode coherent phonon excitation is employed as the standard candle. The high temporal resolution and the significant visibility to very low dynamical contrast in diffraction signals via high-precision phase-space manipulation give strong support to the working principle for the new high-brightness femtosecond electron microscope systems. [ABSTRACT FROM AUTHOR]
- Subjects :
- PHONONS
RADIO frequency
ELECTRON microscopes
Subjects
Details
- Language :
- English
- ISSN :
- 23297778
- Volume :
- 11
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Structural Dynamics
- Publication Type :
- Academic Journal
- Accession number :
- 176929565
- Full Text :
- https://doi.org/10.1063/4.0000242