An enormous number of investigations using molecular jet based Fourier transform microwave spectroscopy has come up since this technique was established almost a century ago and has become more and more popular in the last decade. The complexity of molecules studied by this method also increased dramatically, and still shows a great potential in the future towards even more complex systems with applications in diverse research fields. With the capability to observe the spectra of heavier and larger molecules, microwave spectroscopy is emphasizing and consolidating its key role in yielding precise information on various physical and chemical objectives.

Understanding (coupled) large amplitude motions: the interplay of microwave spectroscopy, spectral modeling, and quantum chemistry

The Rotational Spectrum and Complete Heavy Atom Structure of the Chiral Molecule Verbenone

Rotational spectra of the low energy conformers observed in the (1R)-(−)-myrtenol monomer

The microwave spectrum of the dimer Ar-1,3-difluorobenzene from 2 to 18 GHz is reported. The spectrum has been observed using a chirped-pulse Fourier transform microwave (CP-FTMW) spectrometer that has recently been expanded to include the 2-6 GHz region of the electromagnetic spectrum. Details of this upgraded spectrometer are reported. Eighty-seven transitions were observed for the parent dimer spectrum, which was adequately fit to a semirigid rotational Hamiltonian consisting of A, B, and C as well as four quartic centrifugal distortion constants. Observations of 13C species in natural abundance were aided by utilizing smaller chirp ranges of 7-9 and 9-11 GHz for 1.9 million and 3.73 million averages, respectively. Assignment of 13C isotopologues allowed for determination of the Kraitchman coordinates of the carbon atoms as well as inertial fits of the complex. The quantum-chemical structure predicts an Ar to monomer center of mass distance of 3.48 A, compared with 3.564(1) A determined from experimental structural analysis. This new study indicates that in fluorinated benzene-Ar dimers, when the fluorines are separated by more carbon atoms, the Ar-ring center distance decreases.

Microwave Spectra and Structure of Ar-1,3-Difluorobenzene.

A chirped pulse Fourier transform microwave spectrometer with multi-antenna detection

The CP-FTMW spectrum of bromoperfluoroacetone

The microwave spectrum of 3-bromo-1,1,1,2,2-pentafluoropropane has been observed using CP-FTMW spectroscopy. Potential energy scans have been performed and confirm the existence of two conformers –...

https://par.nsf.gov/servlets/purl/10107048

High-resolution spectroscopy near the continuum limit: the microwave spectrum of trans-3-bromo-1,1,1,2,2-pentafluoropropane

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The CP-FTMW spectrum of bromoperfluoroacetone

High-resolution spectroscopy near the continuum limit: the microwave spectrum of trans-3-bromo-1,1,1,2,2-pentafluoropropane