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 14 of 14 for “"photodetachment"”.
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Dipole moment effects in photodetachment from cluster anions
… studies on the effect of the dipole moment on photodetachment from solvated iodide anion are presented. The major advantage of using solvated atomic iodide anions: I<super>−</super>·(Y)<sub><italic>n</italic></sub>: Y = solvent molecule, <italic>n</italic>=1 to 3)) to study this …
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Effects of Anion Excited States on Photodetachment of Negative Ions
… dissertation, effects of anion excited states on photodetachment of negative ions containing transition metals will be presented. Evidence of autodetachment (sudden change in photodetachment cross section and photoelectron agular distribution) is observed for diatomic (AgF<super>-</super>, …
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Photodetachment Studies of Atomic Negative Ions Through Velocity-Map Imaging Spectroscopy
… photons. The VMI spectrometer has been used in photodetachment studies of the Group 14 negative ions Ge-, Sn-, and Pb- at a photon wavelength of 532 nm. Measurements of the photoelectron angular distributions and asymmetry parameters for Ge- and Sn- were benchmarked against those measured …
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Methyl Halide Cluster Anion Photoelectron Spectra and Angular Distributions as a Probe of Electron-Molecule Interactions
… &ndash molecule interactions using cluster anion photodetachment. Photodetachment from an atomic centered cluster anion produces a free electron and a residual neutral species at a geometry near that of the unperturbed neutral ground state. Evidence of the free electron &ndash molecule …
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Photoelectron Imaging of Iodide Centered Alkyl Halide Cluster Anions
… dissertation presents results from cluster anion photodetachment experiments of the solvated iodide anion as a means of investigating electron molecule interaction. Due to the localization of the excess charge on the iodine atom, these experiments proceed analogously to electron scattering …
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Photoelectron circular dichroism of anionic chiral metal complexes and deprotonated molecules
… anions are considered. It can be called PECD in photodetachment or anion PECD. This approach simplifies the experiment since photodetachment requires in general less energy than ionization. Therefore, single photoelectron emission is achievable using common table-top lasers. Furthermore, mass …
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Photoinitiated Dynamics of Cluster Anions via Photoelectron Imaging and Photofragment Mass Spectrometry
… lead to cluster photodissociation in addition to photodetachment. We investigate these competing processes by means of photoelectron imaging spectroscopy combined with tandem time-of-flight (TOF) mass spectrometry. Photoelectron images are reported for members of the [(CO2)n(H2O)m]- cluster …
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Laser spectroscopy of molecular ions in an ion beam
… a two-photon resonant photodetachment experiment was performed, with detection of fast neutral C{dollar}\sb2{dollar}. The experiment yields a measurement of the R(10) line of the 1-0 band in the B-X electronic transition. In CO{dollar}\sp{+}{dollar}, the blended Q(1) and …
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Exotic Species of Hydrogen
… data. In Part II of this thesis, we investigate photodetachment processes of the negative Hydrogen ion in strong laser-field regimes. A Keldysh-Faisal-Reiss theory allows semiclassical interpretations of complex ionization mechanisms in strong laser-fields due to its conformity with the Feynman …
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Molecular Electronic Structure via Photoelectron Imaging Spectroscopy
… ion generation, mass selection, laser photodetachment, and photoelectron ion imaging were all done in a photoelectron imaging spectrometer described in detail. Results from simplistic systems, OH- and CH-, are used to illustrate the general and fundamental capabilities of imaging …
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Beobachtung und Steuerung molekularer Dynamik mit Femtosekunden-Laserpulsen
… stark einschränkte. Anhand des molekularen Photodetachments CH2I2-->CH2+I2 wurde gezeigt, dass durch die Analyse der optimalen Pulsformen Informationen über die Dynamik dieses Prozesses gewonnen werden können. Dazu wurde zunächst in einem Pump-Probe-Experiment die Dynamik der …
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Dissociation, relaxation, and oxidation of highly vibrationally excited gas phase metal carbonyl and cluster anions.
… Finally, the photodissociation and photodetachment behavior of the M₂(CO)(n)- (where M = Cr, Mn, Fe, and Co; and 4 ≤ n ≤ 9, depending on the metal) and Al(n)- (n = 3 to 23) was investigated at 1064 nm and, for the dinuclear complexes, from 575 to 630 nm. Apparent metal atom loss from …
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Exploring the Chemistry of Methoxide with Oxygen through Photoelectron Imaging Spectroscopy
… of electron kinetic energy, corresponding to photodetachment to each the ground X 2A′′ and excited A 2A′ electronic states of the neutral HO2 radical. These are modeled with the p-d variant of the generalized mixed-character model, and the results are compared to O2 and NO to gain insights …