TY - CHAP

T1 - Microwave Spectroscopy

T2 - Experimental Techniques

AU - Grabow, Jens Uwe

AU - Caminati, Walther

N1 - Funding Information: We thank all microwavers who contributed over many years in countless productive co-operations. J.-U.G is indebted to his coworkers D. Banser, M. Rosemeyer, M. Schnell, J. Fritzsche, M. Hess, H. Saal, E. Locatelli, D. Dewald, M. Jahn, M. Vogt, D. Bremm, the electronic and mechanical workshop in Hannover as well as H. Dreizler, A. Guarnieri, H. Mäder, W. Stahl, D. Sutter, and P. Thaddeus. W.C. is thankful to P. G. Favero, R. D. Brown, and A. Bauder. J.-U.G is grateful for funds from the Bundesministerium für Bildung und Forschung (BMBF), the Deutsche Akademische Austauschdienst (DAAD), the Fonds der Chemie, the Land Niedersachsen, and explicitly for the crucial support provided by the Deutsche Forschungsgemeinschaft (DFG).

PY - 2009

Y1 - 2009

N2 - The field of microwave (MW) spectroscopy is progressing impressively, partially by virtue of the experimental developments that combine jet-expansion sources with specific means of sample preparation for new chemical systems. But even more important, progress is due to advancements in experimental equipment, namely, the rise of very sensitive time domain techniques with high resolution. Although structural studies continue to be a strength of rotational spectroscopy, many of the problems that came to researchers' attention for investigation in the recent years involve processes of intramolecular dynamics, such as conformational, tautomeric equilibria, and other large-amplitude motions as well as intermolecular vibrational energy redistribution and isomerization. A large variety of techniques are developed to record spectra that are associated with transitions between rotational states. For most molecules and molecular systems, these transitions occur in the microwave (MW) region. Numerous interesting systems such as molecules with multiple internal motions, larger complexes, aggregates, biomolecules, and transient species can almost routinely be treated now. The studies also cover different kinds of intermolecular interactions, extending from hydrogen bonding and van der Waals interactions to the effects observed in quantum solvation. The development of pulsed excitation multiresonance techniques and the advent of real-time broadband microwave excitation and detection are impressively widening the capabilities of rotational spectroscopy to characterize the structure and dynamics of larger molecular species.

AB - The field of microwave (MW) spectroscopy is progressing impressively, partially by virtue of the experimental developments that combine jet-expansion sources with specific means of sample preparation for new chemical systems. But even more important, progress is due to advancements in experimental equipment, namely, the rise of very sensitive time domain techniques with high resolution. Although structural studies continue to be a strength of rotational spectroscopy, many of the problems that came to researchers' attention for investigation in the recent years involve processes of intramolecular dynamics, such as conformational, tautomeric equilibria, and other large-amplitude motions as well as intermolecular vibrational energy redistribution and isomerization. A large variety of techniques are developed to record spectra that are associated with transitions between rotational states. For most molecules and molecular systems, these transitions occur in the microwave (MW) region. Numerous interesting systems such as molecules with multiple internal motions, larger complexes, aggregates, biomolecules, and transient species can almost routinely be treated now. The studies also cover different kinds of intermolecular interactions, extending from hydrogen bonding and van der Waals interactions to the effects observed in quantum solvation. The development of pulsed excitation multiresonance techniques and the advent of real-time broadband microwave excitation and detection are impressively widening the capabilities of rotational spectroscopy to characterize the structure and dynamics of larger molecular species.

UR - http://www.scopus.com/inward/record.url?scp=84882910607&partnerID=8YFLogxK

U2 - 10.1016/B978-0-444-53175-9.00014-3

DO - 10.1016/B978-0-444-53175-9.00014-3

M3 - Contribution to book/anthology

AN - SCOPUS:84882910607

SN - 9780444531759

SP - 383

EP - 454

BT - Frontiers of Molecular Spectroscopy

PB - Elsevier

ER -