Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 119 for “"Absorption spectrum"”.
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The microwave absorption spectrum of deutero formaldehyde
Thesis (B.S.) Massachusetts Institute of Technology. Dept. of Physics, 1951.
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The far-infrared absorption spectrum of low temperature hydrogen gas
The far-infrared absorption spectrum of normal hydrogen gas has been measured from 20-320 cm' (A=500-31 pm), over the temperature range 21-38 K, and the pressure range0.6-3 atmospheres. The spectra cover the very weak and broad collision-induced translational absorption band of 112 which at these …
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Quantum mechanical origin of the plasmonic properties of noble metal nanoparticles
… clusters (less than 2 nm) display a discrete absorption spectrum characteristic of molecular systems whereas larger particles display a strong, broad absorption band in the visible. The latter feature is due to the surface plasmon resonance, which is commonly explained by the collective …
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Electronic and Optical Properties of Self -Assembled Quantum Wires
Finally, the excitonic absorption spectrum for the SILO quantum wires are investigated by using our envelope function model.
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Electron Transfer in Mixed-Valence Binuclear Ferrocenes
… doublet is seen in the 4.5 K Mossbauer spectrum for the triiodide salt of 3-acetylbis-(fulvalene)diiron(1+). An IT band at 7140 cm('-1) (e = 1740 M('-1) cm('-1)) is evident in the electronic absorption spectrum. A relatively isotropic EPR signal and a C-H bending band at 840 cm('-1) in …
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A Nanosecond Laser Spectrophotometric and Product Investigation of the Chemistry of Fluorenylidene
… been presented for a reassignment of transient absorptions in the reported transient absorption spectrum, most notably, that in acetonitrile, a nitrile ylide has been observed, formed from the interaction of fluorenylidene with the solvent.
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"Part A. Functional Modular Phenylacetylene Units: A ""Molecular Turnstile."" Part B. Progress Towards an Electrochemically Active 9-Phenylcarbazole Hyperbranched Polymer"
… is provided by an observed red shifting in the absorption spectrum and chemical derivatization with bromine in carbon tetrachloride. These initial observations suggest that an in depth characterization of hyperbranched products from this family of compounds is warranted.
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Long-lived states induced by extended illumination of carbonmonoxy-myoglobin
… by monitoring the time dependence of the absorption spectrum of the sample after photodissociation.
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Using Polarised HI Absorption to Estimate Distances to Supernova Remnants
… application of a new technique, which uses the absorption of the polarised radio emissions from supernova remnants by neutral atomic hydrogen to determine kinematic distances. An absorption spectrum towards the supernova remnant DA 530 was observed with the Synthesis Telescope at the Dominion …
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Optical absorption of pure and mixed silver halides a low temperatures
The low level indirect optical absorption of pure AgCl and AgBr has been measured between 4.20 K and0 77 K . The corresponding indirect optical absorption of AgCl~AgBr mixed crystals has also been measured in the same temperature range. The temperature dependence of the absorption spectra of pure …
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Optical Pumping of Rubidium Spin in a Solid Argon Matrix
… implanted rubidium atoms. We observed that the absorption spectrum of the rubidium could be modified by incident laser light. This modification could be reversed by applying an additional light source. In addition, we were able to create spin polarization and measure a longitudinal spin …
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The Application of a Reporter Group to α-Chymotrypsin
… It was demonstrated that substrates perturb the spectrum of the reporter-modified chymotrypsin and that the spectral perturbations have characteristics related to a tentative but consistent interpretation of changes in the absorption spectrum of the reporter group in terms of the environment of …
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Photochemical Studies of Rhodopsin, Purple Membrane, and Their Analogues
Rhodopsin and analogues. The absorption spectrum of the bathoproduct of rhodopsin, which contains 11-cis retinal as chromophore, is obtained at 77(DEGREES) K under the condition that on the average less than one photon can be absorbed by each rhodopsin molecule. The spectrum, with (lamda)(,max) at …
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Near infrared transient absorption spectra of photolyzed myoglobin at low temperatures
"We have measured the transient absorption spectrum of photolyzed sperm whale carboxymyoglobin as a function of temperature and time after photolysis. Our measurements extend from 60K to 220K and from three microseconds to thirty seconds. We see an absorption band near 758 nm which is known as band …
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Electronic and Optical Properties of Self-Assembled Quantum Wires
… our model are presented. Finally, the excitonic absorption spectrum for the SILO quantum wires are investigated by using our envelope function model.
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Long lived states induced by extended illumination of carbonmonoxy-myoglobin
… by monitoring the time dependence of the absorption spectrum of the sample after photodissociation. After a period of intense illumination with light, the recombination kinetics slow down. The proteins are ""pumped"" to longer lived states. After waiting, the system resets, such that a …
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Exciton transport and thermodynamics in gallium arsenide quantum wells
This thesis describes the use of optical absorption and photoluminescence spectroscopy in understanding the spatial transport and energy relaxation of excitons in quantum well systems. I discuss the mechanism of carrier-induced changes in the absorption spectrum of a 210A GaAs multiple quantum …
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Antioxidant activity of Mn-salophen complex and its effects on antioxidant enzymes in Escherichia coli
… dihydrate and salophen in ethanol. Visible absorption spectrum of the red-brown solution exhibited a broad absorption band at 430 - 450 nm with two shoulders between 500 and 600 nm which were absent with either salophen or manganic acetate alone. Titration of salophen with manganese(III) was …
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A Coupled Bio-Optical and Mixed Layer Model for the Equatorial Pacific
… in the chlorophyll a specific phytoplankton absorption spectrum. Additional simulations were used to investigate the role of phytoplankton induced turbidity on the mixed layer for ENSO (warm SST) and Non-ENSO (cold SST) conditions at 140°W.</p> <p>In general, the simulations show that the …
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