Hippler, Michael F. A. - University of Sheffield

个人简介

Dr. Hippler obtained his Dipl. Phys. (diploma degree in Physics) from the Technical University of Karlsruhe, Germany in 1989. Subsequently, after his PhD in Chemistry from Heriot-Watt University in 1993, he became Postdoctoral research assistant and head teaching assistant at the Laboratorium für Physikalische Chemie of the ETH Zürich in Switzerland. In 2001 he did his "Habilitation" and "venia legendi" in Physical Chemistry at the ETH Zürich, after which he became a Lecturer in Physical Chemistry (Privatdozent) at the same institution. In 2005 he was appointed as a Senior Lecturer at the University of Sheffield.

研究领域

The aim of my research is the development of new methods and applications of ultra-sensitive, high-resolution laser spectroscopy to study the structure and dynamics of molecules and clusters. The understanding of intramolecular primary processes in polyatomic molecules at the fully quantum dynamical level remains among the most challenging research questions in physics and chemistry, with applications also in biology and environmental sciences. High-resolution spectroscopy is among the most powerful tools in advancing such research and it is crucial in this context to develop new and ever more powerful spectroscopic experiments. In my work in Zürich, I successfully developed new experimental techniques for the infrared laser spectroscopy of gas-phase molecules. These techniques have been applied to the study of intramolecular vibrational energy redistribution, vibrational mode-specific tunnelling of hydrogen-bonded clusters and stereomutation dynamics. In one class of experiments, pulsed IR laser systems are used to excite vibrational transitions and a second, subsequent UV laser pulse to ionise the excited molecules. Ionisation detection of IR excitation has been coupled with a mass spectrometer thus adding a second dimension to optical spectroscopy. In another class of experiments, the extreme sensitivity of cavity-ring-down (CRD) spectroscopy (effective absorption path lengths of several km) is combined with the very high resolution of continuous wave (cw) diode lasers (100 kHz). This technique has been applied to measure accurately the transition strengths and weak overtone transitions of molecules (nitrous oxide, methane) and of hydrogen-bonded clusters (HF dimer). So far in Sheffield, I have studied molecular association by FTIR, Raman spectroscopy and high-level quantum-chemical calculations. For this purpose, I set up a very sensitive stimulated Raman experiment with photoacoustic detection ('PARS'). Among the intermolecular forces, the hydrogen-bond X-H...Y is particularly relevant. A hydrogen bond usually exhibits a characteristic 'red'-shift (shift to lower wavenumbers) of the X-H stretching vibration, but more unconventional 'blue'-shifting hydrogen bonds also occur and have become a hot topic of current research. In Sheffield, I have recently studied some unusual, "blue-shifting" hydrogen bonds (e.g., CHCl3...SO2 in the gas phase and open HCOOH structures in liquid formic acid) by theory and experiment.

近期论文

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Conte M & Hippler MFA (2016) Dynamic-NMR and Quantum-Chemical Study of the Stereochemistry and Stability of the Chiral MoO 2 (acac) 2 Complex in Solution. The Journal of Physical Chemistry A. View this article in WRRO Tinajero-Trejo M, Rana N, Nagel C, Jesse HE, Smith TW, Wareham LK, Hippler M, Schatzschneider U & Poole RK (2016) Antimicrobial Activity of the Manganese Photoactivated Carbon Monoxide-Releasing Molecule [Mn(CO) 3 (tpa-κ 3 N )] + Against a Pathogenic Escherichia coli that Causes Urinary Infections. Antioxidants & Redox Signaling, 24(14), 765-780. View this article in WRRO Hippler M (2015) Cavity-Enhanced Raman Spectroscopy of Natural Gas with Optical Feedback cw-Diode Lasers. Analytical Chemistry, 87(15), 7803-7809. View this article in WRRO Vitórica-Yrezábal IJ, Libri S, Loader JR, Mínguez Espallargas G, Hippler M, Fletcher AJ, Thompson SP, Warren JE, Musumeci D, Ward MD & Brammer L (2015) Coordination Polymer Flexibility Leads to Polymorphism and Enables a Crystalline Solid-Vapour Reaction: A Multi-technique Mechanistic Study. Chemistry - A European Journal, 21(24), 8799-8811. View this article in WRRO Salter R, Chu J & Hippler M (2012) Cavity-enhanced Raman spectroscopy with optical feedback cw diode lasers for gas phase analysis and spectroscopy.. Analyst, 137(20), 4669-4676. Spencer CL, Watson V & Hippler M (2012) Trace gas detection of molecular hydrogen H(2) by photoacoustic stimulated Raman spectroscopy (PARS).. Analyst, 137(6), 1384-1388. Mohr C, Spencer CL & Hippler M (2010) Inexpensive raman spectrometer for undergraduate and graduate experiments and research. Journal of Chemical Education, 87(3), 326-330. Hippler M, Hesse S & Suhm MA (2010) Quantum-chemical study and FTIR jet spectroscopy of CHCl(3)-NH(3) association in the gas phase.. Phys Chem Chem Phys, 12(41), 13555-13565. Hippler M, Mohr C, Keen KA & McNaghten ED (2010) Cavity-enhanced resonant photoacoustic spectroscopy with optical feedback cw diode lasers: A novel technique for ultratrace gas analysis and high-resolution spectroscopy.. J Chem Phys, 133(4), 044308. Hippler M, Oeltjen L & Quack M (2007) High-resolution continuous-wave-diode laser cavity ring-down spectroscopy of the hydrogen fluoride dimer in a pulsed slit jet expansion: two components of the N=2 triad near 1.3 microm.. J Phys Chem A, 111(49), 12659-12668.