Fabry–Perot cavity pulsed Fourier transform microwave spectrometer with a pulsed nozzle particle source

Balle, T. J.; Flygare, W. H.

doi:10.1063/1.1136443

Cited by 1,447 publications

(785 citation statements)

References 46 publications

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“…The molecular signal is passed to a very-low-noise amplifier (15) followed by a second low-noise amplifier (16). The combined gain is chosen to be just sufficiently high for the insertion losses in the subsequent stages of the signal processing only having a negligible impact on the S/N ratio, thus realizing the widest dynamic range at optimum sensitivity.…”

Section: (A) Impact-ftmwmentioning

confidence: 99%

“…15 The present study on nicotine follows our interest to examine relevant biomolecules by the high resolution of microwave spectroscopic techniques. The combination of supersonic-jets with Fourier transform microwave (FTMW) spectroscopy [16][17][18] has proved to be a powerful tool in the investigation of the conformational behavior of gas phase biomolecular systems. In such studies, vaporization of biomolecules is achieved through the laser ablation molecular beam (LA-MB-FTMW) technique 19,20 or heating methods.…”

Section: Introductionmentioning

confidence: 99%

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Rapid probe of the nicotine spectra by high-resolution rotational spectroscopy

Grabow

Mata

Alonso

et al. 2011

Phys. Chem. Chem. Phys.

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Nicotine has been investigated in the gas phase and two conformational forms were characterized through their rotational spectra. Two spectroscopic techniques have been used to obtain the spectra: a new design of broadband Fourier transform microwave (FTMW) spectroscopy with an in-phase/quadrature-phase-modulation passage-acquired-coherence technique (IMPACT) and narrowband FTMW spectroscopy with coaxially oriented beam-resonator arrangement (COBRA). The rotational, centrifugal distortion and hyperfine quadrupole coupling constants of two conformers of nicotine have been determined and found to be in N-methyl trans configurations with the pyridine and pyrrolidine rings perpendicular to one another. The quadrupole hyperfine structure originated by two 14 N nuclei has been completely resolved for both conformers and used for their unambiguous identification.

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Section: (A) Impact-ftmwmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rapid probe of the nicotine spectra by high-resolution rotational spectroscopy

Grabow

Mata

Alonso

et al. 2011

Phys. Chem. Chem. Phys.

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“…The rotational spectrum of succinic acid was recorded using three spectrometers: the spectra in the cm-wave region (7-26 GHz) were obtained using two high-resolution pulsed supersonic jetexpansion Fourier transform microwave (FT-MW) spectrometers of Balle-Flygare-type 39 in Hannover (2-26 GHz) 40 and Bilbao (4-18 GHz), 41 both using the COBRA technique. 42 In the 48-70 GHz mm-wave region the spectra were recorded using a free-jet, Stark-modulated absorption spectrometer at Monash University, that has been modified with solid state sweep oscillator sources.…”

Section: Experimental Methodsmentioning

confidence: 99%

Conformational steering in dicarboxy acids: the native structure of succinic acid

Jahn

Méndez

Nair

et al. 2015

Phys. Chem. Chem. Phys.

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The torsional freedom of the carbon backbone and hydroxyl groups of succinic acid, an important platform chemical fi nding numerous industrial applications as well as being the focus of considerable research in atmospheric science, is elucidated. The question of the potential presence of numerous conformers is answered by an unambiguous identifi cation of the structural and molecular properties using microwave and millimeter wave spectroscopy. The precise spectroscopic data provides evidence that the anomalous tendency of "folding the methylene unit" is favoured. Succinic acid, a dicarboxylic acid molecule, has been investigated spectroscopically with computational support to elucidate the complex aspects of its conformational composition. Due to the torsional freedom of the carbon backbone and hydroxy groups, a large number of potentially plausible conformers can be generated with an indication that the gauche conformer is favored over the trans form. The microwave and millimeter wave spectra have been analyzed and accurate spectroscopic constants have been derived that correlate best with those of the lowest energy gauche conformer. For an unambiguous conformational identification measurements were extended to the monosubstituted isotopologues, precisely determining the structural properties. Besides bond distances and angles, particularly the dihedral angle has been determined to be 67.76(11)1, confirming the anomalous tendency of the methylene units to favor gauche conformers when a short aliphatic segment is placed between two carbonyl groups.

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“…The FTMW spectrometers used today are designed following the model proposed by Balle and Flygare (1981), stimulated by Fourier transform-nuclear magnetic resonance (FT-NMR) spectroscopy.…”

Section: Mmw-ftmw Double Resonancementioning

confidence: 99%

THz and Submillimeter‐wave Spectroscopy of Molecular Complexes

Tanaka

Harada

Yamada

2011

Handbook of High‐resolution Spectroscopy

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This article reviews the recent progress of terahertz (THz) and submillimter‐wave (SMMW) spectroscopy in the frequency range of 10–300 cm −1 and its application to the study of weakly bound molecular complexes. The first section describes the light sources used for generating THz radiation, which includes the backward‐wave oscillators (BWO), the multipliers with the GaAs monolithic membrane diode (MOMED), and the supperlattice electronic devices (SLED), as well as the tunable far infrared (TuFIR) lasers. In the following section, we introduce extremely sensitive spectrometers developed for observing very weakly bound molecular complexes, such as the intra‐cavity OROTRON spectrometer and the millimeterwave‐Fourier transform microwave (MMW‐FTMW) double resonance spectrometer. We also review the traditional millimeter‐wave spectrometers, electric‐resonance optothermal spectrometers (EROS), and the tunable far‐infrared (TuFIR) laser spectrometers, which have also been applied successfully to study weakly bound molecular complexes. In the last section, the recent topics of the THz and millimeterwave spectroscopy of molecular complexes are reviewed in the four subsections; (i) Rare gas‐molecule complexes: Rg‐HX, Rg‐CO, and Rg‐HCN, (ii) dimers: (CO) 2 , CO‐N 2 , HCN‐H 2 , and (H 2 O) 2 , (iii) water complexes (H 2 O) n , with n up to 6, and (iv) ion and radical complexes: ArSH, ArH 2 O, H 2 OHO 2 , and ArH 3 + .

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Fabry–Perot cavity pulsed Fourier transform microwave spectrometer with a pulsed nozzle particle source

Cited by 1,447 publications

References 46 publications

Rapid probe of the nicotine spectra by high-resolution rotational spectroscopy

Rapid probe of the nicotine spectra by high-resolution rotational spectroscopy

Conformational steering in dicarboxy acids: the native structure of succinic acid

THz and Submillimeter‐wave Spectroscopy of Molecular Complexes

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