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Diagonal and Off-Diagonal Anharmonicity in Hydrogen-Bonded Systems

by Matthias Heger
Doctoral thesis
Date of Examination:2016-04-20
Date of issue:2016-05-11
Advisor:Prof. Dr. Martin A. Suhm
Referee:Prof. Dr. Martin A. Suhm
Referee:Prof. Dr. Ricardo Mata
Referee:Prof. Dr. Alec Wodtke
Referee:Prof. Dr. Burkhard Geil
Referee:Prof. Dr. Konrad Koszinowski
Referee:PD Dr. Thomas Zeuch
crossref-logoPersistent Address: http://dx.doi.org/10.53846/goediss-5641

 

 

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Abstract

English

The stretching wavenumber of a functional group exhibits a characteristic shift towards lower energies when serving as a hydrogen bond donor. This well-known effect constitutes an important tool for the study of such intermolecular interactions, and the observations are typically interpreted with the aid of quantum chemical calculations. However, the majority of these calculations are only feasible in a harmonic vibrational approximation, thus leaving a fundamental gap to the true experimental situation. It is therefore desirable to describe the spectroscopic shifts in terms of their harmonic and anharmonic contributions. To this end, the present thesis investigates a number of hydrogen-bonded model systems by means of vibrational spectroscopy in supersonic jets and cryogenic matrices. In conjunction with predictions from a wide range of quantum chemical calculations up to high levels of accuracy, the findings are able to provide a consistent picture for the desired decomposition of the observable spectroscopic effects.
Keywords: Vibrational Spectroscopy; Molecular Spectroscopy; Anharmonicity; Quantum Chemistry; Hydrogen Bonding; Intermolecular Interactions
 

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