Adiabatische Korrektur der Born-Oppenheimer-Näherung beim GeS und GeSe / Adiabatic Correction of the Born-Oppenheimer Approximation for GeS and GeSe

1976 ◽  
Vol 31 (3-4) ◽  
pp. 374-380 ◽  
Author(s):  
W. U. Stieda ◽  
E. Tiemann ◽  
T. Törring ◽  
J. Hoeft
Keyword(s):  
Dipole Moment ◽  
High Precision ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Rotational Constant ◽  
Frequency Range ◽  
Rotational Spectra ◽  
Oppenheimer Approximation

Abstract The rotational spectra of GeS and GeSe were measured in the frequency range of 66 GHz to 110 GHz with high precision. The breakdown of the Born-Oppenheimer approximation was observed for the rotational constant yol. With the known molecular 37-factor and the electric dipole moment the adiabatic part of the Born-Oppenheimer correction can be extracted from the primary observa-tion on y01. The adiabatic correction is very similar in both molecules but differs from the results in the earlier measurements on PbS.

Isotopieeffekte im Rotationsspektrum des SiS / lsotopic Effects in the Rotational Spectrum of SiS

1972 ◽  
Vol 27 (11) ◽  
pp. 1566-1570 ◽  
Author(s):  
E. Tiemann ◽  
E. Renwanz ◽  
J. Hoeft ◽  
T. Törring
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Rotational Constant ◽  
Higher Order ◽  
Rotational Spectrum ◽  
Oppenheimer Approximation ◽  
Isotopic Effects

Abstract Corrections resulting from the breakdown of the Born-Oppenheimer approximation were obtained by a detailed discussion of the higher order isotopic effects of the rotational constant Y01 . This analysis yields the sign of the electric dipole moment to be positive (+SiS-) and the sign of the molecular gJ-value to be negative. The magnitude of the adiabatic correction was evaluated.

Rotational Spectra of the Less Common Isotopomers, Electric Dipole Moment and the Double Minimum Inversion Potential of H2O···HCl

2000 ◽  
Vol 104 (30) ◽  
pp. 6970-6978 ◽  
Author(s):  
Z. Kisiel ◽  
B. A. Pietrewicz ◽  
P. W. Fowler ◽  
A. C. Legon ◽  
E. Steiner
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Rotational Spectra

The Microwave Spectrum of 4-Methylisoxazole: 14N Nuclear Quadrupole Coupling, Methyl Internal Rotation and Electric Dipole Moment

1987 ◽  
Vol 42 (5) ◽  
pp. 501-506 ◽  
Author(s):  
W. Jäger ◽  
H. Dreizler ◽  
H. Mäder ◽  
J. Sheridan ◽  
C. T. Walls
Keyword(s):  
Dipole Moment ◽  
Internal Rotation ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Microwave Spectrum ◽  
Centrifugal Distortion ◽  
Frequency Range ◽  
Principal Axes ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

The microwave spectrum of 4-methylisoxazole has been investigated in the frequency range from 8 to 40 GHz, employing both Stark and Fourier transform spectroscopy. We present the results from a 14N quadrupole hyperfine structure, a fourth-order centrifugal distortion and an IAM methyl internal rotation analysis. The components of the electric dipole moment with respect to the principal axes of inertia have been obtained from the Stark splittings of some rotational lines.

Rotational Spectra, Molecular Structure, and Electric Dipole Moment of PropanethialS-Oxide

1999 ◽  
Vol 103 (25) ◽  
pp. 4948-4954 ◽  
Author(s):  
Jennifer Z. Gillies ◽  
Elizabeth Cotter ◽  
Charles W. Gillies ◽  
Hugh E. Warner ◽  
Eric Block
Keyword(s):  
Molecular Structure ◽  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Rotational Spectra

Electric dipole moment of SrF X 2Σ+ from high-precision stark effect measurements

1985 ◽  
Vol 113 (4) ◽  
pp. 351-354 ◽  
Author(s):  
W.E. Ernst ◽  
J. Kändler ◽  
S. Kindt ◽  
T. Törring
Keyword(s):  
Dipole Moment ◽  
High Precision ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Stark Effect

Spectroscopic investigations of hydrogen bonding interactions in the gas phase. IV. The heterodimer H 2 0 • • • HF: the observation and analysis of its microwave rotational spectrum and the determination of its molecular geometry and electric dipole moment

1980 ◽  
Vol 372 (1750) ◽  
pp. 441-451 ◽  
Keyword(s):  
Hydrogen Bonding ◽  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Heavy Atom ◽  
Molecular Geometry ◽  
Rotational Spectrum ◽  
Rotational Constants ◽  
Rotational Spectra ◽  
Out Of Plane

The microwave rotational spectra of the isotopic species H 2 18 0 • • • H 19 F, H 2180 • • • H 19 F, HD 16 0 • •. HF, D 2 16 0 • • • DF and D 2 18 0 • • • DF of the hydrogen bonded heterodimer formed between water and hydrogen fluoride have been observed and analysed to give rotational constants. Evidence from the effects of nuclear spin statistical weights in the spectra leads to the conclusion that the dimer H 20 • • • HF is either planar with C2V symmetry or pyramidal with Cg symmetry but with a low barrier to inversion of the configuration at oxygen. r0-values of the heavy atom distance 0 * • • F have been derived from the observed rotational constants, the value for H 2160 • • • H 19 F being 2.662 Aj. The measured values of electric dipole moment in the vibrational ground state and in the state having v^{0) = 1 are 4.07 and 3.80 D respectively. These values show that excitation of the out-of-plane hydrogen bonding bending mode vP(0) leads to a large decrease in the dipole moment.

ROTATIONAL SPECTRA OF RbF BY THE ELECTRIC RESONANCE METHOD

1958 ◽  
Vol 36 (2) ◽  
pp. 171-183 ◽  
Author(s):  
H. Lew ◽  
D. Morris ◽  
F. E. Geiger Jr. ◽  
J. T. Eisinger
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Internuclear Distance ◽  
Electric Dipole ◽  
Molecular Beam ◽  
Resonance Method ◽  
Mass Ratio ◽  
Electric Resonance ◽  
Rotational States ◽  
Rotational Spectra

Transitions between the J = 0 and J = 1 rotational states of RbF have been measured by means of the molecular beam electric resonance method. The following rotational constants have been determined (all frequencies in Mc./sec):[Formula: see text]The quadrupole interaction constants −eqQ/h in the J = 1 state are found to be[Formula: see text]The equilibrium internuclear distance is re = (2.26554 ± 0.00005) × 10−8 cm. The electric dipole moment of Rb85F in the ν = 0 state is μ = (8.80 ± 0.10) × 10−18 e.s.u. The mass ratio of the Rb isotopes is M85/M87 = 0.9770148 ± 0.0000052.

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