Introduction to ultrafast electron microscopy
소속 :
연사 : Dr. Sang Tae Park (caltech)
일시 : 2012-01-05 16:00 ~
장소 : 503동 327호
일 시 : 2012년 1월 5일, 4:00 PM
장 소 : 503동 327호
-Abstract-
Electron diffraction has been successfully employed to determine molecular and lattice structure with a picometer accuracy. Microscopy can now image an object with a sub-angstrom resolution. However, structures in these studies are subject to time-averaging, and therefore static in nature. Visualization of molecular reaction and structural dynamics in real time requires spatiotemporal resolution in atomic scales. Ultrafast electron diffraction and microscopy employ ultrashort electron pulse via photoelectric effect to probe structures in transit. The recent development of these techniques enabled us to directly study various chemical and physical phenomena, such as dissociation, rearrangement, intersystem crossing, phase transition, thermal expansion, nanomechanical vibration, etc. In this presentation, the concept, history, and future aspect of ultrafast structural dynamics techniques are reported.
장 소 : 503동 327호
-Abstract-
Electron diffraction has been successfully employed to determine molecular and lattice structure with a picometer accuracy. Microscopy can now image an object with a sub-angstrom resolution. However, structures in these studies are subject to time-averaging, and therefore static in nature. Visualization of molecular reaction and structural dynamics in real time requires spatiotemporal resolution in atomic scales. Ultrafast electron diffraction and microscopy employ ultrashort electron pulse via photoelectric effect to probe structures in transit. The recent development of these techniques enabled us to directly study various chemical and physical phenomena, such as dissociation, rearrangement, intersystem crossing, phase transition, thermal expansion, nanomechanical vibration, etc. In this presentation, the concept, history, and future aspect of ultrafast structural dynamics techniques are reported.
