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 15 of 15 for “"Ion Spectroscopy"”.
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Metabolite identification using infrared ion spectroscopy
Contains fulltext : 286937.pdf (Publisher’s version ) (Open Access)
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Novel techniques for molecular ion spectroscopy in a discharge
Velocity modulation laser spectroscopy has proven to be a successful spectroscopic technique for the study of molecular ions; indeed, it has become the conventional technique. However, there are a number of limitations to velocity modulation in its conventional form. First, there is a background …
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The NICE-OHVMS technique: realizing the full potential of precision molecular ion spectroscopy
… Enhanced Optical Heterodyne Velocity Modulation Spectroscopy (NICE-OHVMS) is one of the most sensitive spectroscopic techniques specific to molecular ions. NICE-OHVMS relies on the combination of three separate techniques, each of which is a powerful tool. Cavity enhancement extends the …
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Construction And Demonstration Of A Tandem Mass Spectrometer Based Instrument For Cold Ion Spectroscopy
<p>A new instrument incorporating ion trap based tandem mass spectrometry and cold ion UV and UV-IR double resonance spectroscopy has been developed at Purdue University for the study of gas phase, biologically relevant ions. The instrument incorporates multiple quadrupole linear ion trap mass …
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Dynamics of single clusters in intense light pulses studied with ion spectroscopy and light scattering
… Auflösung abzubilden. Im Rahmen dieser Dissertation wurden Cluster mit extrem-ultravioletter (XUV) Strahlung des FLASH-FEL in Hamburg abgebildet, sowie laserinduzierte Prozesse in der Probe mit infraroten (IR) Pulsen untersucht. Für die Experimente wurden ein Fokussier- und ein motorisiertes, …
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Cryogenic surface electrode ion traps with integrated superconducting microwave resonators for polar molecular ion spectroscopy
… also makes them suitable for quantum information manipulation or for tests of fundamental laws of nature. These experiments require precise control over the molecular internal degrees of freedom. There are few present proposals for trapping and cooling molecules. One proposal is based on …
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New techniques for sub-Doppler spectroscopy of molecular ions
… new methods for performing high-resolution sub-Doppler spectroscopy of molecular ions in the laboratory. Molecular ions are of interest to a variety of fields, from astrochemistry to fundamental physics to the study of chemical reactive intermediates. The limiting factor in developing a …
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Electronic spectroscopy of flavins in a cryogenic 22 - pole ion trap
… great biological relevance, but little information is known about the isolated flavins. This dissertation deals with the electronic photodissociation spectroscopy of cryogenically cooled flavins. The optical spectra are recorded with a tandem mass spectrometer coupled to a cryogenic 22 - pole …
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Progress in sensitive mid-infrared spectroscopy of cooled molecular ions
The spectroscopic investigation of molecular ions is key to facilitating a better understanding of chemical and physical processes that occur both here on Earth and among distant stars. However, numerous challenges are encountered when attempting to study these highly reactive species in the …
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Development of a sensitive mid-infrared spectrometer for the study of cooled molecular ions
The study of molecular ions is relevant to many areas of scientific interest. Mid-infrared laser spectroscopy functions as a useful tool for understanding the role of molecular ions in these areas. To this end, a broadly tunable mid-infrared difference frequency generation noise-immune …
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Thermochemical differences in lysine and lysine-homolog containing oligopeptides: Determination of basicity and gas-phase structure through mass spectrometry, infrared spectroscopy, and computational chemistry
… in sequence and sidechain affect the basicity, ion stability, and conformation of a peptide. The peptides characterized were acetylated polyalanine di-, tri-, and tetra- peptides containing a proton-accepting probe: lysine and or the non-proteinogenic lysine-homologs: ornithine, …
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Absolute molecular electronic spectroscopy at UV and soft X-Ray energies by hihg-energy electron impact
Dipole (e,e) spectroscopy has been used to determine absolute photoabsorption oscillator strengths (cross sections) for electronic excitation of CC14, CH3OH, NH3, CH3NH2, (CH3)2NH, and (CH3)3N at energy resolutions in the range 0.048-1.0 eV fwhm. These data have been obtained in the valence, and …
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Sensitive and high-precision rovibrational spectroscopy of molecular ions relevant to astronomical and quantum chemistry
High-precision spectroscopy of molecular ions has enabled new discoveries in astronomy and provided valuable benchmarks for ab initio calculations of molecular structure. Astronomers and theorists require accurate and precise laboratory measurements of rotational and rovibrational transition …
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High-accuracy and high-precision infrared spectroscopy of fundamental molecular ions using noise immune cavity enhanced optical heterodyne velocity modulation spectroscopy
"Solving the Schrodinger equation for molecules is anything but trivial given the multi-body nature of the problem, and exact solutions are not achievable ab initio. Therefore, quantum mechanical calculations on molecules require approximate treatment in order to calculate quantities such as energy …
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Characterization Of Charge Accommodation In Biologically Important Hydrogen-Bonded Clusters
The underlying motivation of chemical physics and physical chemistry is to understand naturally occurring chemical and physical processes from the nanoscopic molecular level to the macroscopic condensed phase. Over the past half-century, experimentalists have developed a number of laser-based …