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Showing 1 to 20 of 92 for “"Laser excitation"”.
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Energy absorption and vibrational heating in molecules following intense laser excitation.
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Physics.
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Infrared Laser Excitation and Fluorescence Spectra: A Study of Intramolecular Vibrational Energy Relaxation
Infrared fluorescence measurements have been used to determine the presence or absence of intramolecular vibrational relaxation (or more precisely state mixing) from an excited C-H stretch in twenty three representative molecules varying in size from methane to norbornene. Included are aliphatic …
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Application of Time-Resolved Laser-Excitation Fluorometry to the Study Ofprimary Photosynthetic Processes
Made available in DSpace on 2014-12-10T19:07:14Z (GMT). No. of bitstreams: 1 7405586.pdf: 3973095 bytes, checksum: ea45a34060f9f8aacbe526e47340c267 (MD5) Previous issue date: 1973
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Fluorescence Decay of Pyrene Butyric Acid Attached to Macromolecules: A Study by Pulsed Laser Excitation
Made available in DSpace on 2015-05-12T21:41:55Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7013526.PDF: 4524942 bytes, checksum: 31e69bc088c2804aa8e6d815ab9feee6 (MD5) Previous issue date: 1969
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Applying Novel Material Characterization Techniques using Ultrafast Laser Excitation and Neutron Diffraction in Radiation Detector Crystals
To address outstanding issues in the growth and performance of crystals for radiation detection, I develop and employ several material characterization techniques not previously implemented in the field. Two main, interconnected issues are addressed: the cracking of certain crystals during the …
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Novel NIR Endoscopic Techniques for Medical Imaging – An Investigation Considering both LED and LASER Excitation Sources
… Green as a fluorescent marker at Near Infrared excitation wavelengths is well established in clinical imaging. Typical systems comprise multiple LED sources, or even Xenon bulbs, for optimal imaging which can result in unnecessary energy transfer to patients and contribute to tissue damage. The …
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A Dynamic Study of the Electronic States of Nitrogen-Dioxide Using Tunable Organic Dye Laser Excitation
Made available in DSpace on 2014-12-10T23:01:23Z (GMT). No. of bitstreams: 1 7219921.pdf: 5330611 bytes, checksum: c6a1f589596064b0febebd42fe66b748 (MD5) Previous issue date: 1972
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Raman Scattering Studies of Aluminum-Gallium - Arsenide Based Semiconductor Superlattices (Phonons, Interfaces)
… temperatures, and resonant and non-resonant laser excitation.
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Photoassociative excitation spectroscopy of excimer molecules
Laser excitation spectroscopy of transitions having dissociative ground states was explored as a tool for the study of excimer molecules. Since the repulsive nature of the ground state constrains collision pairs to large internuclear transitions, bound $\gets$ free excitation spectra contain more …
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Bioanalytical applications of fluorescence line-narrowing and non-line-narrowing spectroscopy interfaced with capillary electrophoresis and high-performance liquid chromatography
… one achieves the high sensitivity afforded by laser-induced fluorescence (LIF) (≈attomole) and high selectivity provided by FLN spectra, whose rich and sharp (≈5 cm-1) vibrational structure serves as fingerprints. Fluorescence line-narrowing is operative at temperatures close to 4 K. …
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Control of blood clotting using gold nanorods
… externally controlled release of biomolecules by laser excitation. Femtosecond pulsed laser irradiation at the NR longitudinal surface plasmon resonance peak (LSPR) can excite the NRs and induce melting, and thus cause release of drug or biomolecular payload on the NR. Because the peak wavelength …
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Length dependence of the Raman spectra of carbon nanotubes
… were studied using several different values of laser excitation energy. We study the length and excitation energy dependence of various features, each reflecting different physical processes, in the Raman spectra of the length sorted nanotubes. Specifically, the G-band (which includes the G+ and …
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Excitons in cuprous oxide: high mobilities and strain confinement
… results for paraexcitons using low power laser excitation are given and compared to theory. The discouraging result that the paraexcitons do not seem to thermalize in the well within their lifetime is obtained. Interparticle kinetics of the excitons i~ examined under increasing laser …
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Design, development, and testing of a stochastically modulated Raman spectrometer
… architecture that stochastically modulates the laser excitation wavelength. Small changes in excitation will proportionally shift the Raman scatter while having little effect on other spectral artifacts, including fluorescence.
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Novel dilute nitride semiconductor materials for mid-infrared applications
… hardly any energy shift with increasing laser excitation power while it redshifts with increasing temperature. The emission from the localised states blueshifts with increasing laser excitation power and temperature. Rapid thermal annealing on InAsN layers improved the photoluminescence …
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Luminescence studies of photoexcited electron-hole plasmas in silicon and germanium
… plasma (Ef:JP} in Si following pulsed laser excitation at temperatures below 50 K. The goal here was to determine the rate at which the photoexcited carriers expand fran the excitation surface into the crystal and. to determine the primary motive force. We found that for laser …
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Development of single molecule total internal reflection fluorescence microscope
… with capabilities including a wide excitation wavelength range (400-2000 nm) both in objective-type and prism-type TIRF configurations, localization accuracy ~1 nm, temporal resolution ~1 ms, and alternate laser excitation. As an application, we have measured high-throughput …
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Synthesis and characterization of nanoparticle suspensions: Towards quantitative surface-enhanced Raman spectroscopic sensing
… resonance of SERS nanoprobes with respect to laser excitation wavelength is essential for maximizing detectable SERS signal. Additionally, the reporter molecule load per particle depends on synthesis conditions and the shape of the nanoparticles. Together, well-characterized suspensions can be …
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Photo-produced phonons in semiconductors
… sources in Si, Ge and GaAs at 1.7K. Focused-laser excitation of a semiconductor generates phonons as a byproduct of electronic excitation. A single carrier sheds this excess by the emission of optical phonons which cascade down in frequency, $\nu,$ by the normal anharmonic processes as they …
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