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 6 of 6 for “"Coupled vibrations"”.
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Coherent two-dimensional infrared spectroscopy : a study of coupled vibrations
… fluctuations in a model system of two strongly coupled carbonyl stretching vibrations are reflected by the elongation of the cross peaks along the diagonal of the 2D spectrum. The dynamics of this correlation is monitored by the changes in the 2D line shapes and successfully modeled using a …
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A tale of coupled vibrations in solution told by coherent two-dimensional infrared spectroscopy
… the molecular structure and dynamics of coupled vibrations in solution on a picosecond timescale. The strongly coupled asymmetric and symmetric carbonyl stretches of Rh(CO)₂C₅H₇0₂ (RDC) dissolved in hexane serve as a convenient model system. Fourier transform 2D IR spectra are obtained …
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ΣΥΖΕΥΓΜΕΝΕΣ ΤΑΛΑΝΤΩΣΕΙΣ ΑΞΟΝΩΝ ΜΕ ΡΩΓΜΗ
… THE ASSYMETRY IN THE CRACK AREA CAUSES COUPLED VIBRATIONS. THIS PROPERTY IS USED TO DEVELOP A NEW METHOD FOR THE DETECTION OF A CRACK IN ROTATING AND NON-ROTATING SHAFTS. THE EXPERIMENTS SHOW VERY GOOD AGREEMENT OF THE ANALYTICAL AND EXPERIMENTAL RESULTS.
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The effect of cracks on the dynamic behavior of bars and shafts
… longitudinal vibration of a cracked bar and the coupled vibrations of a cracked rotating shaft. In the longitudinal vibration study, the equation of motion is developed for a cantilevered bar with a symmetric surface crack. Next, Galerkin's Method is used to obtain one- and two-term approximate …
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Two-dimensional infrared spectroscopy of nucleic acids : application to tautomerism and DNA aptamer unfolding dynamics
… difficulties in modeling highly delocalized and coupled vibrations of nucleobases. This thesis initiated the efforts to develop 2D IR spectroscopy of nucleic acids by first characterizing the 2D IR spectra and vibrational eigenstates of nucleobases, using a model of multiple anharmonically …
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Vibrational dynamics of aqueous hydroxide solutions studied using ultrafast infrared spectroscopy
… system on few tens of femtoseconds timescale. Vibrations in aqueous hydroxide solutions are sensitive to the strength of hydrogen bonding and hence vibrational frequencies, intensities and line shapes are closely associated with the structure and dynamics of the hydroxide ions. In this thesis, …