Direct imaging of ultrafast lattice dynamics
نویسندگان
چکیده
منابع مشابه
Direct lattice imaging of small metal particles
Observations on small vapour-deposited particles of silver and gold with direct lattice imaging in the Cambridge University 600 kV high-resolution electron microscope have established unambiguously the presence of dislocations in particles as small as 15nm in diameter. The detailed structure of more complicated ' polyparticles ' can also be characterized directly. Knowledge of the internal and ...
متن کاملUltrafast zone-center coherent lattice dynamics in ferroelectric lithium tantalate.
Femtosecond time-resolved pump-probe experiments were carried out to study ultrafast lattice dynamics of ferroelectric lithium tantalate. Both the fully symmetric (A1 mode) and doubly degenerate (E mode) coherent phonons at the center of the Brillouin zone were excited via impulsive stimulated Raman scattering, as confirmed by the excitation intensity dependence.
متن کاملDirect imaging of transient molecular structures with ultrafast diffraction.
Ultrafast electron diffraction (UED) has been developed to study transient structures in complex chemical reactions initiated with femtosecond laser pulses. This direct imaging of reactions was achieved using our third-generation apparatus equipped with an electron pulse (1.07 +/- 0.27 picoseconds) source, a charge-coupled device camera, and a mass spectrometer. Two prototypical gas-phase react...
متن کاملImaging ultrafast dynamics of molecules with laser-induced electron diffraction.
We introduce a laser-induced electron diffraction method (LIED) for imaging ultrafast dynamics of small molecules with femtosecond mid-infrared lasers. When molecules are placed in an intense laser field, both low- and high-energy photoelectrons are generated. According to quantitative rescattering (QRS) theory, high-energy electrons are produced by a rescattering process where electrons born a...
متن کاملUltrafast electron beam imaging of femtosecond laser-induced plasma dynamics
Plasma dynamics in the early stage of laser ablation of a copper target are investigated in real time by making ultrafast electron shadow images and electron deflectometry measurements. These complementary techniques provide both a global view and a local perspective of the associated transient electric field and charge expansion dynamics. The results reveal that the charge cloud above the targ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Science Advances
سال: 2019
ISSN: 2375-2548
DOI: 10.1126/sciadv.aau8044