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.
Results
Showing 1 to 20 of 127 for “"photon energy"”.
-
Harvesting photon energy : ultra-thin crystalline silicon solar cell & near-field thermoradiative cells
Photons from the sun and terrestrial sources have great potential to satisfy the energy demand of humans. This thesis studies two types of energy conversion technologies, photovoltaic solar cells based on crystalline silicon thin films and thermal-radiative cells using terrestrial heat sources, …
-
Understanding The Influence of Photon Energy On 6Mv Non Reference Dosimetry and Ct Dosimetry Using Tld and Osld
… work. The first objective was to evaluate the energy dependence of TLD and OSLD for non-reference measurement conditions in a radiotherapy environment. The second objective was to fully characterize the OSLD nanoDot in a CT environment, and to provide validated calibration procedures for CT …
-
Variable Energy Photoelectron Spectra Of Organometallic Compounds Of The Late Transition Metals
… spectroscopy (PES) studies with variable photon energy for organometallic molecules of late transition metals, including cobalt, rhodium, iridium, nickel, palladium, platinum, copper, and silver. Synchrotron radiation (in the range of 30 to 170 eV photon energy) and traditional helium I …
-
Photoionization and Photofragmentation of the Endohedral Xe@C60+ Molecular Ion
… + endohedral molecular ion is presented in the photon energy range of the well-known Xe 4d giant resonance, and evidence of redistribution of the Xe 4d oscillator strength in photon energy due to multipath interference is reported. Experiments were conducted at undulator beamline 10.0.1 of the …
-
Differential cross sections for the reaction He[superscript 3] ([gamma],[rho]) H[superscript 2] from 45 to 150 MeV
… for the reaction He 3 (y,p)H2 were measured for photons of 45 to 150 MeV at five angular settings: (theta p , theta d) = (30°, 142°) I (60°, 106°), (90° I 75°), (120°, 47.5°), and (135°, 34.5°) in the laboratory. At ep of 60° and 90°, [equation] was obtained for photon energies down to 40 MeV. A …
-
A study of photon-nucleus collisions at high transverse energy
… the first time, the atomic number dependence of photon-nucleus collisions at high transverse energy. The measurements were made at FNAL by using a large acceptance calorimeter with 50-400 GeV photons incident on LH$\sb2,$ LD$\sb2,$ Be, C, Al, Cu, Sn and Pb targets. The cross section is …
-
The synthesis, characterization, and application of carborane-cluster based macrocycles and boron nitride nanosheets in photovoltaics
… (SQ) limit. DSSCs require incident photon energy in the visible spectrum for the cell to produce a usable current. While the possibility of absorbing two</p> <p>near-infrared photons is a known concept for surmounting the SQ limit, the opportunities presented by mesoporous systems …
-
Photoionization of Se Ions for the Determination of Elemental Abundances in Astrophysical Nebulae
… All ions except Se5+ were measured from the energy region of the low-lying metastable state thresholds to at least 10 eV above the ionization potential. Theoretical calculations for Se5+ indicated strong resonances above 100 eV would dominate the photoionization spectrum, therefore this …
-
Coincident neutron/proton pairs from lithium-6 photodisintegration with 40-100 MeV photons
Bremsstrahlung photons with endpoint energies from 55 to 100 MeV were used to photodisintegrate $\sp6$Li nuclei, and emitted neutron/proton pairs were observed in coincidence. Measurement of the energies and angles of the emitted pair allowed reconstruction of the photon energy, as well as the …
-
The three-body photodisintegration of helium-3
… a nucleus are interacting and absorb an incident photon, they can break up in a marrer kinematically similar to a deuteron, hence the name quasideuteron This effect had previously been seen in 3He above 75 MeV photon energy. This kinematically complete experiment measured the three-body …
-
Eta photoproduction study with the upgraded Glasgow tagger at MAMI
… of this S_11 intermediate state, for incident photons in the energy range 700 to 1400MeV. The S_11(1535) is a well-established resonance, but its composition is a contentious topic, requiring further experimental data to distinguish between competing theories. The MAMI electron accelerator was …
-
Quantification of complex DNA damage by ionising radiation: An experimental and theoretical approach
… correspondence. The ionisation density of low energy, secondary electrons produced by photons was assessed experimentally from the dependence of the yield of OH radicals escaping intra-track recombination on photon energy. As energy decreases the OH radical yield initially decreases reflecting …
-
Photoproduction of the Λ*(1520 Hyperon off Protons and Neutrons In Deuterium
… decay angle distributions are extracted in the photon energy region 1.75 GeV < E<sub>γ</sub> < 5.50 GeV. This is the first time that exclusive photoproduction of Λ<sup>*</sup>(1520) on neutrons has been reported. Moreover our results on protons extend to higher energies than the previous …
-
Photoluminescence studies of hydrogenation and other defect-related processes in III-V compound semiconductors
… at about room temperature. The LIR dependence on photon energy, illumination intensity, sample temperature and chemical identity of the passivated acceptor species indicates that LIR is electronically stimulated via recombination-enhanced vibrational excitation of acceptor-hydrogen complexes. A …
-
Electroreflectance of gallium arsenide
… of n-type gallium arsenide in the 1.2 - 5.3 eV photon energy range has been measured. The 6e l and 6e2 l1neshapes of six different critical points were analyzed in detail by fitting the one-electron Frapz-Keldysh-Aspnes theory to each separate critical point structure observed. The Eo critical …
-
Measurement of CP asymmetry in [beta] --> [sigma] [gamma] decays using a sum of exclusive final states
… flavor-specific B decay modes containing a high energy photon and a hadronic Xs system. We measure the CP asymmetry to be -0.011 ± 0.030stat ± 0.014syst for a photon energy threshold at 1.6 GeV and the hadronic system mass between 0.6 and 2.8 GeV/c2.
-
Photoelectron holography of metal adsorbates on semiconductor surfaces
… the photoelectron wave as a function of incident photon energy and/or emission direction, namely the interference between the direct path of the photoelectron to the detector and the path which scatters off neighboring atoms. This interference creates oscillations which can be directly Fourier …
-
Photoproduction of neutral pions in helium by 335 MEV Bremsstrahlung
… coherent production of neutral pions from He4 by photons to an energy of 335 MeV. Bremsstrahlung from the University of Illinois 340 MeV betatron impinged upon a gaseous He4 target cooled to 20.4oK. The recoil nucleus was detected with a semiconductor telescope in coincidence with at least one …
-
Optical absorption measurements on silver halides in the ultraviolet and extreme ultraviolet energy ranges
… film transmission measurements in the range of photon energy from 3.5 to 6.7 electron volts and from 30 to 240 electron volts. An unusual feature of this work is the use of electron synchrotron radiation for measurements in the high energy range. Optical constants have been calculated over the …
Page 1 of 7