Jaeger, Wolfgang - University of Alberta

个人简介

Ph.D., Christian Albrechts University

研究领域

Physical and chemical properties of condensed phase matter are often determined by non-bonded intermolecular interactions, such as van der Waals interactions and hydrogen bonding. A fundamental description of these macroscopic properties requires detailed knowledge about the corresponding microscopic interactions, i.e., interactions on the molecular level. Similarly, certain biological processes, such as protein folding and molecular recognition, can be regarded as the concerted action of many microscopic site interactions. A prerequisite for exploring and understanding the link between molecular interactions and macroscopic properties is the availability of accurate potential energy surfaces for binary interactions. A further step is then the investigation of ternary - systems in order to extract information about non-pairwise additive contributions to the interaction energy. The most detailed and accurate experimental information about such interactions can be obtained using spectroscopic methods. The research objective is the investigation of rotational and ro-vibrational spectra of binary and ternary van der Waals complexes. The complexes are formed in a pulsed supersonic molecular expansion and then subjected to a microwave excitation pulse. The resulting molecular coherent spontaneous emission signal ("super-radiation", "free-induction-decay") is A/D-converted and stored in a fast transient recorder. A Fourier transformation of the time-domain signal gives the frequency spectrum. Intermolecular vibrational transitions are detected with a newly developed double resonance technique, using Terahertz radiation sources. The research offers the opportunity to be involved in a diverse range of areas: from development and use of state-of-the-art scientific instrumentation, computer programming for experiment control and spectral analyses to syntheses of isotopically labelled compounds.

近期论文

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Paul L. Raston and Wolfgang Jäger:“Microwave Spectroscopy of the Seeded Binary and Ternary Clusters CO-(pH2)2, CO-pH2-He, CO-HD, and CO-(oD2)N=1,2.”J. Chem. Phys., accepted for publication. T. M. Fahim Amin, M. Qamrul Huda, John Tulip, and Wolfgang Jäger:“Design and Fabrication of a Long Arm Comb Drive Rotary Actuator with Externally Mounted Mirror for Optical Applications.”J. Microelectromech. S., accepted for publication. Elijah G. Schnitzler, Brandi L. M. Zenchyzen, and Wolfgang Jäger:“High-resolution Fourier-transform microwave spectroscopy of methyl- and dimethylnaphtalenes.”Astrophys. J., accepted for publication. T. M. Fahim Amin, M. Qamrul Huda, John Tulip, and Wolfgang Jäger:“A Virtual Pivot Point MEMS Actuator with Externally Mounted Mirror: Design, Fabrication and Characterization.”Sens. Transducers J. 183, 65-71 (2014). Elijah Schnitzler, Ashneil Dutt, André M. Charbonneau, Jason S. Olfert, and Wolfgang Jäger:“Soot aggregate restructuring due to coatings of secondary organic aerosol derived from aromatic precursors.”Environ. Sci. Technol. 48, 14309-14316 (2014). Javix Thomas, Wolfgang Jäger, and Yunjie Xu:“Chirality induction and amplification in the 2,2,2-Trifluoroethanol••propylene oxide adduct.”Angew. Chem. 126, 7405–7408 (2014). Paul L. Raston, Gary Douberly, and Wolfgang Jäger:“Single and Double Resonance Spectroscopy of Methanol Embedded in Superfluid Helium Nanodroplets.”J. Chem. Phys. 141, 044301 - 1-13 (2014). Javix Thomas, Agapito Serrato III, Wei Lin, Wolfgang Jäger and Yunjie Xu:“Perfluorobutyric acid and its monohydrate: a chirped pulse and cavity based Fourier transform microwave spectroscopic study.”Chem. Eur. J. 20, 6148-6153 (2014). Elijah G. Schnitzler and Wolfgang Jäger:“The benzoic acid–water complex: a potential atmospheric nucleation precursor studied using microwave spectroscopy and ab initio calculations.”Phys. Chem. Chem. Phys. 16, 2305-2314 (2014). Javix Thomas, Oleksandr Sukhorukov, Wolfgang Jäger, and Yunjie Xu:“Direct spectroscopic detection of unique free OH orientation in methyl lactate--(water)1,2 clusters: hydration of a chiral hydroxy ester.”Angew. Chem. Int. Ed. 53, 1156-1159 (2014). Angew. Chem. 126, 1175-1178 (2014). Javix Thomas, Jensen Yiu, Johannes Rebling, Wolfgang Jäger, and Yunjie Xu:“Chirped-pulse and cavity-based Fourier transform microwave spectroscopy of a chiral epoxy ester: methyl glycidate.”J. Phys. Chem. A 117, 13249-13254 (2013). Javix Thomas, Oleksandr Sukhorukov, Wolfgang Jäger, and Yunjie Xu:“Chirped pulse and cavity based FTMW spectra of the methyl lactate - ammonia adduct: lock and key selectivity and internal rotation motions.”Angew. Chem. 125, 4498-4501 (2013). M. Qamrul Huda, John Tulip, and Wolfgang Jäger:“Mid-infrared external cavity lasing through suppression of Fabry-Perot oscillation.”Proc. SPIE 8631, 86311R - 1-7 (2013). M. Qamrul Huda, T. M. Fahim Amin, Yuebin Ning, Graham McKinnon, John Tulip, and Wolfgang Jäger:“Fabrication of thin vertical mirrors through plasma etch and KOH:IPA polishing for integration into MEMS electrostatic actuators.”Proc. SPIE 8612, 86120D - 1-8 (2013). Steve Dempster, Oleksandr Sukhorukov, Qi-Yi Lei, and Wolfgang Jäger:“Rotational spectroscopic study of hydrogen cyanide embedded in small 4He clusters.”J. Chem. Phys. 137, 174303 - 1-8 (2012). T. M. Fahim Amin, M. Qamrul Huda, Yuebin Ning, Graham McKinnon, John Tulip, and Wolfgang Jäger:“A virtual pivot point MEMS rotary comb actuator for tunable laser applications.”Proc. SPIE 8490, 84900D - 1-9 (2012). Paul L. Raston, Donald D. Kelloway, and Wolfgang Jäger:“Infrared spectroscopy of HOCl embedded in superfluid helium nanodroplets: Probing the dynamical response of the solvent.”J. Chem. Phys. 137, 014302 - 1-6 (2012). Simon Merz, Nicolas Vanhaecke, Wolfgang Jäger, Melanie Schnell, and Gerard Meijer:“Decelerating molecules with microwave fields.”Phys. Rev. A 85, 063411 (2012). Paul L. Raston, Wolfgang Jäger, H. Li, Robert J. Le Roy, and Pierre-Nicholas Roy:“Observation of Persistent Molecular Superfluidity in para-Hydrogen Clusters.”Phys. Rev. Lett. 108, 253402 - 1-5 (2012). M. Qamrul Huda, John Tulip, and Wolfgang Jäger:“Anti reflection coatings in semiconductor lasers: effects on power emission and external cavity lasing.”Proc. SPIE 8277, 827721 - 1-9 (2012).