Rotational Spectrum of Hydrazine in the Submillimeter Range

Krȩglewski, Marek; Cosléou, J.; Wlodarczak, G.

doi:10.1006/jmsp.2002.8616

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…In in the sub-millimeterwave range [152] and in the infrared range [153,154]. Inversion tunneling was also observed in almost all primary amines such as aniline C6H5−NH2 [155].…”

Section: Inversion Tunnelingmentioning

confidence: 91%

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

Nguyen

Kleiner

2020

Physical Sciences Reviews

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A large variety of molecules contain large amplitude motions (LAMs), inter alia internal rotation and inversion tunneling, resulting in tunneling splittings in their rotational spectrum. We will present the modern strategy to study LAMs using a combination of molecular jet Fourier transform microwave spectroscopy, spectral modeling, and quantum chemical calculations to characterize such systems by the analysis of their rotational spectra. This interplay is particularly successful in decoding complex spectra revealing LAMs and providing reference data for fundamental physics, astrochemistry, atmospheric/environmental chemistry and analytics, or fundamental researches in physical chemistry. Addressing experimental key aspects, a brief presentation on the two most popular types of state-of-the-art Fourier transform microwave spectrometer technology, i.e., pulsed supersonic jet expansion–based spectrometers employing narrow-band pulse or broad-band chirp excitation, will be given first. Secondly, the use of quantum chemistry as a supporting tool for rotational spectroscopy will be discussed with emphasis on conformational analysis. Several computer codes for fitting rotational spectra exhibiting fine structure arising from LAMs are discussed with their advantages and drawbacks. Furthermore, a number of examples will provide an overview on the wealth of information that can be drawn from the rotational spectra, leading to new insights into the molecular structure and dynamics. The focus will be on the interpretation of potential barriers and how LAMs can act as sensors within molecules to help us understand the molecular behavior in the laboratory and nature.

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“…In in the sub-millimeterwave range [152] and in the infrared range [153,154]. Inversion tunneling was also observed in almost all primary amines such as aniline C6H5−NH2 [155].…”

Section: Inversion Tunnelingmentioning

confidence: 91%

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

Nguyen

Kleiner

2020

Physical Sciences Reviews

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“…For example, THz radiation can be produced directly by carcinotron and backward wave oscillator (BWO) sources, by molecular lasers pumped by a high-power CO 2 laser, and by relativistic electron sources, such as synchrotrons and free-electron lasers. [1][2][3][4][5][6][7][8] In addition, the development of quantum cascade lasers (QCL) is underway. 9) On the other hand, in order to overcome the technological limitations of such direct sources, methods of converting power from spectral regions where generation is easier are often used.…”

Section: Terahertz Technologymentioning

confidence: 99%

In situ Measurement of Combustion Gas Using Terahertz Time Domain Spectroscopy Setup for Gas Phase Spectroscopy and Measurement of Solid Sample

Uno

Tabata

2010

Jpn. J. Appl. Phys.

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The transmission properties of gas phase samples heavily contaminated with aerosols, particles, and water vapor generated by combustible materials as well as the feasibility of pollution detection were obtained by terahertz time domain spectroscopy (THz-TDS) in the 0.2 to 3 THz frequency region. The absorption properties of solid-state samples and their correlation with the intensity of real-time THz images were measured using a THz camera in the region of λ≥30 µm. Molecules with weaker dipole moments, such as carbon monoxide, which was detected at higher concentrations in the combustion gas by gas chromatography analysis, did not exhibit sufficient absorption owing to the resolution of THz-TDS. However, no attenuation of transmittance was observed, and we confirmed that THz spectroscopy enables direct and simultaneous measurements of gas phase samples containing contaminants without prefiltration to remove particles in contrast to infrared (IR) spectroscopy. Finally, we confirmed that the absorption properties of solid-state samples correspond to the intensities of real-time THz images.

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“…Direct sources that have demonstrated their utility for spectroscopic based applications include carcinotrons, molecular lasers and relativistic electron sources. Carcinotron or Backward Wave Oscillator (BWO) sources [1,2] can operate at frequencies between 180 and 1500 GHz providing a minimum power in the order of 1 mW. Their spectral purity is also very attractive, permitting a spectrometer resolution of as little as 50 kHz to be achieved.…”

Section: Terahertz Technologymentioning

confidence: 99%

Continuous-wave terahertz by photomixing: applications to gas phase pollutant detection and quantification

Hindle

Cuisset

Bocquet

et al. 2007

Comptes Rendus. Physique

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Recent advances in the development of monochromatic continuous-wave terahertz sources suitable for high resolution gas phase spectroscopy and pollution monitoring are reviewed. Details of a source using an ultra fast opto-electronic photomixing element are presented. The construction of a terahertz spectrometer using this source has allowed spectroscopic characterisation and application studies to be completed. Analysis of H 2 S and OCS under laboratory conditions are used to demonstrate the spectrometer performance, and the determination of the transition line strengths and pressure self broadening coefficients for pure rotational transitions of OCS. The spectral purity 5 MHz, tunability 0.3 to 3 THz, and long wavelength ≈200 µm of this source have been exploited to identify and quantify numerous chemical species in cigarette smoke. The key advantages of this frequency domain are its high species selectivity and the possibility to make reliable measurements of gas phase samples heavily contaminated by aerosols and particles. To cite this article: F.

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Rotational Spectrum of Hydrazine in the Submillimeter Range

Cited by 5 publications

References 9 publications

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

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

In situ Measurement of Combustion Gas Using Terahertz Time Domain Spectroscopy Setup for Gas Phase Spectroscopy and Measurement of Solid Sample

Continuous-wave terahertz by photomixing: applications to gas phase pollutant detection and quantification

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