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Showing 1 to 20 of 209 for “"picosecond"”.
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Picosecond Studies of Unimolecular Reactions
… reactions may best be studied by the use of picosecond spectroscopy. These studies require advanced instrumental and data acquisition techniques. The construction of an apparatus which allows resolution of events on the picosecond timescale is discussed. The streak camera is used as the …
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Picosecond pump-probe diagnostics for combustion
Includes bibliographical references (pages 181-191).
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Picosecond Vibrational Spectroscopy of Shocked Solids
This research was supported by US Army Research Office Contracts DAAH04-93-G-0014 and DAAH04-96-1-0038, Air Force Office of Scientific Research Contracts F49620-94-1-0108 and F49620-97-1-0056, and National Science Foundation Grants DMR 94-04806 and DMR 97-14843.
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Picosecond Kinetics of Reaction Center Chlorophyll
Made available in DSpace on 2014-12-13T20:10:33Z (GMT). No. of bitstreams: 1 7913573.pdf: 6764113 bytes, checksum: d81ee92b91443a213624bf7282cd40da (MD5) Previous issue date: 1978
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Polyelectrolyte multilayers for plasmonics and picosecond ultrasonics
… of polyelectrolyte multilayers in plasmonics and picosecond acoustics. The observed samples were fabricated by the spin-assisted layer-by-layer deposition technique that allowed a precise tuning of layer thickness in the range of few nanometers. The first field of interest deals with the …
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Parametric amplification of mid-infrared picosecond radiation
… for realising a high power tuneable mid-infrared picosecond source, by combining the radiation from a free electron laser with a powerful Nd:YAG pump laser. The method allows obtaining an amplified energy of the order of one millijoule, for pulse durations of few picoseconds and a repetition rate …
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Crossed-Field Sampling of Picosecond Optical Signals
Made available in DSpace on 2014-12-12T20:54:50Z (GMT). No. of bitstreams: 1 7821014.pdf: 3668839 bytes, checksum: 2ad7a4cf4c09292595c047c37e370d97 (MD5) Previous issue date: 1978
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Picosecond Spin Seebeck Effect in Magnetic Insulators
… a thermal gradient that lasts for only a few picoseconds and the SSE signal manifests as broadband THz electric field radiation. The ultra-fast laser excitation and detection technique enable focusing the analysis on the interfacial contributions of the SSE, minimising contributions from the …
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Picosecond studies of free radical reactions in solution
The 2,7-dihalofluorenylidenes were examined. Electron paramagnetic resonance (EPR) spectroscopy shows that these carbenes are ground-state triplets. These carbenes react with methanol to form 9-methoxy ethers. The absence of a heavy atom effect in this reaction suggests that intersystem crossing is …
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Investigations of intramolecular dynamics by picosecond time-resolved spectroscopy
… energy redistribution (IVR) is studied by picosecond time resolved fluorescence depletion (TRFD), a technique which directly measures the ultrafast relaxation processes of the initially prepared vibronic level. Fluorescence depletion decays and dispersed fluorescence spectra of 19 vibronic …
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Application of picosecond interferometry to characterize physical behavior of crystals
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Picosecond Infrared Lasers (PIRL): Applications in Biodiagnostics and Towards Quantitative Mass Spectrometry
A new concept based on the Picosecond Infrared Laser (PIRL) has been introduced to selectively excite water to directly drive ablation of biological tissue faster than any competing energy dissipation process that could damage surrounding tissue. This thesis work showed that this mechanism can be …
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Low-noise frequency synthesis and picosecond timing for satellite laser ranging systems
… to provide time measurement with one picosecond accuracy, thereby enabling the development of a satellite laser ranging (SLR) system with submillimeter precision. Different types of oscillators and frequency multipliers have been developed (RF and microwave) in order to provide a …
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Design and fabrication of nanostructures for thermal conductivity measurements and picosecond acoustics
… of metallic gratings is presented for picosecond acoustics. Generating and detecting picosecond acoustics are interested especially for terahertz regime. We have fabricated aluminum gratings with 300nm and 400nm period with different duty cycle (η=w/p, where w is width of gratings and p …
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Shock compression and flash-heating of molecular adsorbates on the picosecond time scale
… probed with vibrational SFG spectroscopy with picosecond temporal resolution and sub-nanometer spatial resolution. Flash-heating studies of 4-nitrobenzenethiolate (NBT) on Au provided insight into effects from hot-electron excitation of the molecular adsorbates at early pump-probe delay times. …
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Complete characterization of optical pulses in the picosecond regime for ultrafast communication systems
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Non-equilibrium energy transfer and phase change during intense picosecond laser-metal interactions
… of electrons and lattice vibrations. During picosecond laser irradiation of metal films, electrons and the lattice are not in thermal equilibrium. On the other hand, rapid laser heating produces a large degree of superheating and undercooling during melting and solidification. First, this …
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Dynamics of Phonons in Crystals as Studied by Picosecond Coherent Anti-Stokes Raman Spectroscopy
… times of the motions (generally in the picosecond or subpicosecond range) the study of the dynamics is a difficult experimental problem. At the same time, theoretical progress in understanding the dynamics has been difficult due to the complexity of the crystal potential function. In …
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