Investigation of the Stark Shift of the Benzene-d1 101 — 000 Rotational Transition by Microwave Fourier Transform Spectroscopy

1987 ◽  
Vol 42 (1) ◽  
pp. 72-78 ◽  
Author(s):  
Eckhard Fliege ◽  
Helmut Dreizler
Keyword(s):  
Fourier Transform ◽  
Dipole Moment ◽  
Absorption Coefficient ◽  
Rotational Transition ◽  
Stark Shift ◽  
Permanent Dipole Moment ◽  
Fourier Transform Spectrometer ◽  
Deuterium Substitution ◽  
Set Up ◽  
Sample Pressure

The Stark shift of the J'K′_K′+ - J″K_K″+ = 101 - 000 transition of benzene-d1 was investigated to determine the dipole moment caused by deuterium substitution. A modified set-up of the microwave Fourier transform spectrometer was used to be able to apply the necessary Stark voltage and to increase the sensitivity of the instrument. The resulting permanent dipole moment is μa = 0.00810(28) D corresponding to an absorption coefficient of ymax = 2.8 • 10-12 cm-1 , determined at a sample pressure of 1.5 mTorr, for that line.

The Microwave Spectrum and Dipole Moment of Hexafluoropropanone

1991 ◽  
Vol 46 (3) ◽  
pp. 229-232 ◽  
Author(s):  
J.-U. Grabow ◽  
N. Heineking ◽  
W. Stahl
Keyword(s):  
Fourier Transform ◽  
Dipole Moment ◽  
Molecular Beam ◽  
Stark Effect ◽  
Microwave Spectrum ◽  
Fourier Transform Spectrometer ◽  
Centrifugal Distortion ◽  
Rotational Constants ◽  
Centrifugal Distortion Constants

AbstractWe recorded the microwave spectrum of hexafluoropropanone between 7 and 15 GHz using a pulsed molecular beam microwave Fourier transform spectrometer. The rotational constants were determined to be A = 2181.71980(14) MHz, B= 1037.22930(7) MHz, C = 934.89233(8) MHz, the quartic centrifugal distortion constants are D'J= 0.07378 (39) kHz, D'JK = 0.10002(75) kHz, D'K = -0.07269(266) kHz, δ'J = 0.00623(29) kHz and R' 6= 0.00755(12) kHz. Stark effect measurements yielded a dipole moment μ = μb= 0.3949 (18) D

A Microwave Fourier Transform Spectrometer in the Range from 18 to 26.4 GHz Increased Sensitivity Using Circular Waveguides. Measurements of Isotopomeres of Carbonylsulfide and of Methane

1991 ◽  
Vol 46 (5) ◽  
pp. 445-449 ◽  
Author(s):  
V. Meyer ◽  
W. Jäger ◽  
R. Schwarz ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Natural Abundance ◽  
Fourier Transform Spectrometer ◽  
Increased Sensitivity ◽  
Circular Waveguides ◽  
Rotational Transitions ◽  
Set Up

Abstract We present a microwave Fourier transform spectrometer in the region of 18 to 26.4 GHz with an increase in sensitivity roughly by a factor of ten in comparison to a former set up. Measurements of rotational transitions of isotopomers of carbonylsulfide, OCS, in natural abundance and of rovibrational transitions of methane, CH4, illustrate the improvement

scholarly journals A Microwave Fourier Transform Spectrometer in the Region between 26 and 36 GHz

1987 ◽  
Vol 42 (11) ◽  
pp. 1279-1282 ◽  
Author(s):  
H. Dreizler ◽  
U. Andresen ◽  
J. Gripp ◽  
I. Merke ◽  
M. Meyer ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Spectrometer ◽  
Frequency Bands ◽  
Set Up

We present a first set up and tests of a microwave Fourier transform spectrometer above 26 GHz with some features differing from the instruments in the lower frequency bands.

The Microwave Spectrum of Cyanogen Iodide-15N: Hyperfine Structure and Electric Dipole Moment Investigated by Microwave Fourier Transform Spectroscopy

1988 ◽  
Vol 43 (2) ◽  
pp. 133-137 ◽  
Author(s):  
Joachim Gripp ◽  
Helmut Dreizler
Keyword(s):  
Fourier Transform ◽  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Stark Effect ◽  
Rotational Transition ◽  
Microwave Spectrum ◽  
Spin Rotation ◽  
Coupling Parameters ◽  
Cyanogen Iodide

The first rotational transition of cyanogen iodide-15N (IC15N) has been investigated by microwave Fourier transform (MWFT) Stark effect spectroscopy to determine the electric dipole moment. In addition the first four rotational transitions have been measured by MWFT spectroscopy to obtain accurate parameters for the rotational, quadrupole and spin-rotation coupling parameters.

scholarly journals On the Pressure and Temperature Dependence of the Absorption Coefficient of NH3

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
F. Aousgi ◽  
S. Hadded ◽  
H. Aroui
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Absorption Coefficient ◽  
Temperature Dependence ◽  
Quadratic Function ◽  
Fourier Transform Spectrometer ◽  
Absorption Coefficients ◽  
Linear Evolution ◽  
Exponential Law ◽  
Quantum Numbers

The effects of pressure and temperature on the absorption coefficient of ammonia (NH3) gas self-perturbed and perturbed by nitrogen (N2) gas have been measured. We varied the gas pressure from 10 to 160 Torr and the temperature from 235 to 296 K in order to study the absorption coefficient at the center and the wings of lines in the ν4 band of NH3. These measurements were made using a high resolution (0.0038 cm-1) Bruker Fourier-transform spectrometer. These spectra have been analyzed using the method of multipressure technique permitting to succeed to an evolution of the absorption coefficient with the pressure and the quantum numbers J and K of the NH3 molecule. The results show that the absorption coefficient varies as a quadratic function of the pressure at the center of a given line. However, it has a linear evolution in the wings of the line. Moreover, the absorption coefficients are inversely proportional to temperature in the wings when NH3 lines are broadened by N2. The retrieved values of these coefficients were used to derive the temperature dependence of N2 broadening NH3 lines. The absorption coefficients were shown to fit closely the well-known exponential law.

scholarly journals Partial f-Sum Rules for Rotator Strengths

1968 ◽  
Vol 23 (7) ◽  
pp. 1020-1023
Author(s):  
Heinz Dieter Rudolph
Keyword(s):  
Dipole Moment ◽  
Radiation Field ◽  
Oscillator Strength ◽  
Sum Rules ◽  
Rotational Transition ◽  
Permanent Dipole Moment ◽  
Dispersion Theory ◽  
Asymmetric Top ◽  
Level 1 ◽  
The One

In extension of a previous paper partial ƒ-sum rules are derived for the rotator strengths of a freely rotating asymmetric top molecule whose permanent dipole moment interacts with the radiation field. In either of the two relations given the sums run over only part of the possible rotational transitions which start from any particular level: (1) J → J, J+1; (2) J → J, J-1. The two relations express stronger sum rules than the one reported formerly which may be shown to be dependent on those of the present paper. A short outline is given on how the “rotator strength” of this paper may be connected with the “oscillator strength for a rotational transition” of dispersion theory.

Fourier Transform Spectrometry in the Far-Infrared to High-Microwave Spectral Region Using a Rapid-Scan Interferometer

1984 ◽  
Vol 38 (5) ◽  
pp. 678-680
Author(s):  
W Richter
Keyword(s):  
Fourier Transform ◽  
Dielectric Loss ◽  
Spectral Region ◽  
Far Infrared ◽  
Frequency Region ◽  
Fourier Transform Spectrometer ◽  
Low Loss ◽  
Fourier Transform Spectrometry ◽  
Rapid Scan ◽  
Set Up

An experimental set-up, based on a commercial rapid-scan Fourier transform spectrometer, for dielectric loss measurements on low-loss materials in the frequency region between 120 GHz and 1650 GHz (4–55 cm−1) is described Results obtained for cyclohexane are presented as an example of application

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