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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 “"rotational spectroscopy"”.
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Rotational Spectroscopy of Molecular Ions
Made available in DSpace on 2014-12-13T20:10:47Z (GMT). No. of bitstreams: 1 8009019.pdf: 4354821 bytes, checksum: 91befa8e421b9008f874b81936648543 (MD5) Previous issue date: 1979
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Two-dimensional terahertz rotational spectroscopy in the gas phase
Two-dimensional (2D) coherent spectroscopy has been developed to study molecular dynamics and structures for decades, but its extension into the terahertz (THz) regime remains rare. In this thesis, I describe several experiments using two-dimensional terahertz rotational spectroscopy. Employing …
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Database and Application Programming Interface Development for Rotational Spectroscopy
… mixture in the gas phase through experimental rotational spectroscopy and computational tools. A database of spectroscopic data serves as the foundation of the automation pipeline for assigning spectral lines to species. While there are existing databases available for use, we developed our …
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Rotational Spectroscopy of Weakly-Bound Complexes Utilizing a High-Temperature Molecular Source (Microwave)
Rotational spectroscopic studies of several weakly-bound molecular complexes are presented here. These studies were performed using a pulsed Fourier-transform microwave spectrometer, employing a Fabry-Perot cavity and a pulsed, supersonic nozzle. A high-temperature molecular source that permits the …
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Experimental investigations of molecules desorbing from a cold surface with buffer gas cooling and broadband roational spectroscopy : applications in astrochemistry
… with chirped-pulse Fourier transform mm-wave rotational spectroscopy and its successful applications in the study of molecules desorbing from an ice under interstellar-like conditions. The instrument, chirped-pulse ice (CPICE) offers conformer specific detection of molecules in the 60-90 GHz …
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Liberation of low-coordinate phosphorus species from anthracene-based molecular precursors
… nuclear magnetic resonance (NMR) and microwave (rotational) spectroscopy. The mechanism and scope of thermal fragmentation of these molecular precursors is described from experimental kinetic studies bolstered by density functional theory (DFT) calculations. Initial forays into further uses of …
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Laboratory and Observational Studies of Transient Molecules at Microwave and Millimeter/Submillimeter Wavelengths
… this dissertation, techniques of high-resolution rotational spectroscopy have been used to measure the spectra of molecules in both laboratory and astronomical settings. In the laboratory, small metal-bearing molecules containing zinc, iron, nickel, titanium, yttrium, and scandium have been …
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Electronic signatures of large amplitude motions
… electronic-structure-induced splittings in the rotational spectrum of a vibrationally excited state can identify the nature and extent of the distortion of the equilibrium electronic wavefunction and thereby provide a measure of progress along a reaction coordinate. One-dimensional models of the …
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Chirality Determination Using Three-Wave Mixing Microwave Spectroscopy
<p>"Rotational spectroscopy has established itself as a reliable gas-phase spectroscopic technique for the structural determination of molecules. This reliability has stemmed from both advancements in microwave technology and a willingness from the community to push the boundaries of the field. In …
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Cryogenic surface electrode ion traps with integrated superconducting microwave resonators for polar molecular ion spectroscopy
… the coupling of polar molecular ions' rotational states to the microwave radiation. The new approach presented here is based on co-trapping Sr+ atomic ions together with SrCl+ molecular ions in a cryogenic surface electrode RF ion trap and on using the coupling of the molecular ion's …
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Wideband and fast THz spectrometer using dual-frequency-comb on CMOS
Millimeter-wave/terahertz rotational spectroscopy of polar gaseous molecules provides a powerful tool for complicated gas mixture analysis. Here, a 220-to-320 GHz dual-frequency-comb spectrometer in 65-nm bulk CMOS is presented, along with a systematic analysis on fundamental issues of rotational …
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Dynamics of lattice vibrations, molecular rotations and spins studied by terahertz spectroscopy
… using organic nonlinear optical crystals and spectroscopy experiments utilizing THz pulses to study the linear and nonlinear responses of molecular dipole, spin, and lattice degrees of freedom in molecular and condensed-matter systems. We have developed several THz spectroscopy methods …
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Identification of natural product stereochemistry via calculation of ECD spectra
… experiments as well as the standard electronic spectroscopy experiments (UV-Vis, ECD, etc.) or less widespread vibrational and rotational spectroscopy experiments (VCD, ROA, etc.) can be used, often in combination. However, sophisticated synthetic strategies or difficult isolation of the natural …
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Development and demonstration of sampling techniques for a Chirped Pulse Fourier Transform Microwave Spectrometer
… it has become possible to rapidly study the rotational spectra of molecules in the gas phase. It is possible to study molecules that are not normally in the gas phase through the use of various sourcing techniques. The development of both the heated nozzle and the laser ablation sourcing …