The Rotational Spectrum of Trimethylamine Measured by Microwave and Millimeter-Wave Fourier-Transform Spectroscopies and by Sideband Laser Spectroscopy

1995 ◽  
Vol 172 (2) ◽  
pp. 449-455 ◽  
Author(s):  
X.L. Li ◽  
R. Bocquet ◽  
D. Petitprez ◽  
D. Boucher ◽  
L. Poteau ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Laser Spectroscopy ◽  
Millimeter Wave ◽  
Rotational Spectrum

scholarly journals The pure rotational spectrum of the T-shaped AlC2 radical (X̃2A1)

2018 ◽  
Vol 20 (16) ◽  
pp. 11047-11052 ◽  
Author(s):  
D. T. Halfen ◽  
L. M. Ziurys
Keyword(s):  
Fourier Transform ◽  
Millimeter Wave ◽  
Rotational Spectrum ◽  
Frequency Range

The pure rotational spectrum of the AlC2 radical (X̃2A1) has been measured using Fourier transform microwave/millimeter-wave (FTMmmW) techniques in the frequency range 21–65 GHz.

scholarly journals The Rotational Spectrum of Propane Centrifugal Distortion Analysis

1985 ◽  
Vol 40 (5) ◽  
pp. 508-510 ◽  
Author(s):  
G. Bestmann ◽  
H. Dreizler ◽  
J. M. Vacherand ◽  
D. Boucher ◽  
B. P. van Eijck ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Millimeter Wave ◽  
Ground State ◽  
Fourier Transform Spectrometer ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Astrophysical Interest ◽  
Distortion Analysis ◽  
Wave Spectrometer

The ground state rotational spectrum of propane has been investigated between 6.4 and 26.5 GHz with a microwave Fourier transform spectrometer and between 140 and 300 GHz with a millimeter-wave spectrometer. High J transitions have been measured and fitted to a centrifugally distorted Hamiltonian including some sextic coefficients. The results of the analysis are sufficiently accurate for the prediction of all strong transitions of astrophysical interest.

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

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ha Vinh Lam Nguyen ◽  
Isabelle Kleiner
Keyword(s):  
Fourier Transform ◽  
Quantum Chemistry ◽  
Large Amplitude ◽  
Environmental Chemistry ◽  
Broad Band ◽  
Microwave Spectroscopy ◽  
Rotational Spectrum ◽  
Spectral Modeling ◽  
Rotational Spectra ◽  
Large Amplitude Motions

AbstractA 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.

Rotational Spectrum of 1,3-Dioxolane–Argon: A Fourier Transform Investigation

1999 ◽  
Vol 196 (2) ◽  
pp. 338-341 ◽  
Author(s):  
Gianni Maccaferri ◽  
Helmut Dreizler ◽  
Walther Caminati
Keyword(s):  
Fourier Transform ◽  
Rotational Spectrum

Millimeter-Wave and Diode Laser Spectroscopy of I13CN: Analysis of the ν3Band System

1997 ◽  
Vol 182 (1) ◽  
pp. 98-112 ◽  
Author(s):  
C.Degli Esposti ◽  
L. Bizzocchi ◽  
L. Dore ◽  
F. Tamassia
Keyword(s):  
Diode Laser ◽  
Laser Spectroscopy ◽  
Millimeter Wave ◽  
Diode Laser Spectroscopy

Millimeter‐Wave Rotational Spectrum of HSSH and DSSD. I. Q Branches

1968 ◽  
Vol 49 (8) ◽  
pp. 3465-3478 ◽  
Author(s):  
Gisbert Winnewisser ◽  
Manfred Winnewisser ◽  
Walter Gordy
Keyword(s):  
Millimeter Wave ◽  
Rotational Spectrum

33S Nuclear Hyperfine Structure in the Rotational Spectrum of Thiazole

1993 ◽  
Vol 48 (12) ◽  
pp. 1219-1222 ◽  
Author(s):  
U. Kretschmer ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Hyperfine Structure ◽  
Molecular Beam ◽  
Microwave Spectroscopy ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
Centrifugal Distortion Constants

Abstract We investigated the 33S nuclear quadrupole coupling of thiazole- 33S in natural abundance by molecular beam Fourier transform microwave spectroscopy. In addition the 14N nuclear quadrupole coupling could be analyzed with high precision. We derived the rotational constants A = 8529.29268 (70) MHz, B = 5427.47098 MHz, and C = 3315.21676 (26) MHz, quartic centrifugal distortion constants and the quadrupole coupling constants of 33S χaa = 7.1708 (61) MHz and χbb= -26.1749 (69) MHz and of 14N χ aa = -2.7411 (61) MHz and χbb = 0.0767 (69) MHz.

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