X-ray diffuse scattering measurements of nucleation dynamics at femtosecond resolution.
نویسندگان
چکیده
Femtosecond time-resolved small and wide angle x-ray diffuse scattering techniques are applied to investigate the ultrafast nucleation processes that occur during the ablation process in semiconducting materials. Following intense optical excitation, a transient liquid state of high compressibility characterized by large-amplitude density fluctuations is observed and the buildup of these fluctuations is measured in real time. Small-angle scattering measurements reveal snapshots of the spontaneous nucleation of nanoscale voids within a metastable liquid and support theoretical predictions of the ablation process.
منابع مشابه
Visualizing the non-equilibrium dynamics of photoinduced intramolecular electron transfer with femtosecond X-ray pulses
Ultrafast photoinduced electron transfer preceding energy equilibration still poses many experimental and conceptual challenges to the optimization of photoconversion since an atomic-scale description has so far been beyond reach. Here we combine femtosecond transient optical absorption spectroscopy with ultrafast X-ray emission spectroscopy and diffuse X-ray scattering at the SACLA facility to...
متن کاملObservation of femtosecond molecular dynamics via pump–probe gas phase x-ray scattering
We describe a gas-phase x-ray scattering experiment capable of capturing molecular motions with atomic spatial resolution and femtosecond time resolution. X-ray free electron lasers can deliver intense x-ray pulses of ultrashort duration, making them suitable to study ultrafast chemical reaction dynamics in an ultraviolet pump, x-ray probe scheme. A cell diffractometer balances sample flow with...
متن کاملSerial femtosecond X-ray diffraction of enveloped virus microcrystals
Serial femtosecond crystallography (SFX) using X-ray free-electron lasers has produced high-resolution, room temperature, time-resolved protein structures. We report preliminary SFX of Sindbis virus, an enveloped icosahedral RNA virus with ∼700 Å diameter. Microcrystals delivered in viscous agarose medium diffracted to ∼40 Å resolution. Small-angle diffuse X-ray scattering overlaid Bragg peaks ...
متن کاملMeasuring and modeling diffuse scattering in protein X - ray crystallography 1
13 X-ray diffraction has the potential to provide rich information about the structural dynamics of 14 macromolecules. To realize this potential fully, it will be necessary to measure and model both 15 Bragg scattering, which is currently used to derive macromolecular structures, and diffuse 16 scattering, which reports on correlations in charge density variations. However, due to the extra 17 ...
متن کاملMeasuring and modeling diffuse scattering in protein X - ray crystallography 1 Andrew
13 X-ray diffraction has the potential to provide rich information about the structural dynamics of 14 macromolecules. To realize this potential fully, it will be necessary to measure and model both 15 Bragg scattering, which is currently used to derive macromolecular structures, and diffuse 16 scattering, which reports on correlations in charge density variations. However, due to the extra 17 ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 100 13 شماره
صفحات -
تاریخ انتشار 2008