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Showing 1 to 20 of 656 for “"Photoelectron"”.
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Theory of the lunar photoelectron atmosphere
… The equation may be integrated and the photoelectron density found as a function of height for four approximate models. A simple model based upon monoenergetic photons and monoenergetic electrons ejected vertically upward yields rough estimates of the parameters of interest. Another …
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Negative ion photoelectron spectroscopy of cobalt tricarbonylnitrosyl
Photoelectron spectra are reported for the Co(CO)₃NO⁻ and Co(CO)₂NO⁻ anions produced from cobalt tricarbonylnitrosyl in a pulsed valve source. The 355 nm spectra were obtained at a calculated electronic kinetic energy resolution of 96 meV using a newly constructed fixed-frequency negative ion …
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Molecular Electronic Structure via Photoelectron Imaging Spectroscopy
This dissertation explores the use of photoelectron imaging spectrometry to probe the molecular electronic structure of various chemical systems, with an emphasis on photoelectron angular distributions. Experimental ion generation, mass selection, laser photodetachment, and photoelectron ion …
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X-ray photoelectron spectroscopy of silicate glasses
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1987.
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Photoelectron holography of metal adsorbates on semiconductor surfaces
Photoelectron holography, a technique used to determine atomic surface structure, relies on the measurement of interference in 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 …
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Photoemission and photoelectron diffraction studies of semiconductor surfaces
… experimental surface science techniques, such as photoelectron diffraction (PED), photoemission extended fine structure (PEFS), and photoelectron holography (PEH), rely upon the measurement of the interference due to the photoelectron wave scattering from nearby atoms. The intensity oscillations …
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Multiphoton ionization photoelectron spectroscopy of iodine-bearing molecules
… by observing the kinetic energy of the ejected photoelectrons. These experiments have demonstrated that, for photoionization of I$\sb2$, CF$\sb3$I and HI at 532 nm, the scission of the R-I bond (R=I, CF$\sb3$, HI) is favored over direct ionization of the molecule at intensities in the range of …
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Vibrational and anion photoelectron spectroscopy of transition metal clusters
… anion (TaN−). The data is obtained through anion photoelectron spectroscopy via velocity map imaging (VMI), which permits the simultaneous measurement of photoelectron spectra and photoelectron angular distributions (PADs). The study on TaN− reports the first photoelectron spectra of this diatomic …
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Photoelectron Imaging of Iodide Centered Alkyl Halide Cluster Anions
… Cl) detachment. The experimental cluster anion photoelectron angular distribution trends deviate somewhat from the ab initio calculations and experimental electron scattering data. A discussion follows, wherein these deviations are attributed to the incident electron angular momentum and …
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Derivative Photoelectron Holography Studies of Metal -Terminated Semiconductor Surfaces
The technique of Derivative Photoelectron Holography is used to form three dimensional images of the local neighborhood of metal atoms terminating semiconductor surfaces. The arsenic-terminated germanium (111) surface is studied as a test case and the results are shown to be in good agreement with …
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Derivative Photoelectron Holography Studies of Metal-Terminated Semiconductor Surfaces
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-11-14T16:47:55Z No. of bitstreams: 1 reese.pdf: 1659351 bytes, checksum: b62a7e48ff8ee520922a51800c0b08b1 (MD5)
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Femtosecond time-resolved photoelectron spectroscopy in the extreme ultraviolet region
Eine experimentelle Apparatur für Femtosekunden Pump-Probe-Studien reversibler Prozesse im EUV Bereich wurde aufgebaut. Photoelektronenspektren von Einzelkristallen, Adsorbaten und Gasen wurden gemessen. Die zeitaufgelösten Photoelektronenspektren des Pt(110) Valenzbandes zeigen die ultraschnelle …
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Molecular order at polymer surfaces via X-ray photoelectron spectroscopy
… unit Spectroscopy (XPS) is chemistries. X-ray Photoelectron used, particularly with angular dependence, to obtain the compositional gradient information from the top 6 run of the surface. It is found that all materials investigated present some kind of preferential and reproducible ordering …
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Photoelectron circular dichroism of anionic chiral metal complexes and deprotonated molecules
Photoelectron circular dichroism (PECD) emerges as an asymmetry in the spatial distribution (regarding the light direction) of electrons detached from chiral molecules with left or right circular polarized light. In the past two decades PECD spectroscopy has manifested as a potential method for …
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Structure analysis of adsorbates on single crystal surfaces using photoelectron diffraction
… CO has been undertaken using scanned-energy mode photoelectron diffraction utilising the two distinct components of the C 1s photoemission peak. Earlier assignments of CO to atop and bridge sites have been confirmed as well as the respective 2:1 ratio of these assignments. Additionally, …
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Very accurate gas-phase thermochemistry through photoelectron photoion coincidence (PEPICO) spectroscopy
<p>Five projects are presented here that use Photoelectron Photoion Coincidence (PEPICO) Spectroscopy to determine high-accuracy thermochemical data on small and intermediate size molecules and radicals that are relevant in modeling combustion and atmospheric processes. Some of the experiments were …
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Exploring the Chemistry of Methoxide with Oxygen through Photoelectron Imaging Spectroscopy
In this dissertation, photoelectron imaging spectroscopy is employed to probe the gas-phase chemistry between methoxide (CH3O) and oxygen, including evidence of previously unexplored reaction paths and providing further insight into the fundamentals of chemical bonding. First, the known reaction …
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Multiphoton ionization of hydrogen iodide and molecular iodine using photoelectron spectroscopy
… I$\sb2$ molecules were studied by time-of-flight photoelectron spectroscopy using multiphoton ionization techniques. At a pumping wavelength of 532 nm, it was concluded that dissociation due to the intermediate repulsive valence states is very strong for both HI and I$\sb2.$ For HI, the …
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