The Microwave Spectrum of m-Tolunitrile: Methyl Internal Rotation and 14N Nuclear Quadrupole Coupling

2000 ◽  
Vol 200 (2) ◽  
pp. 151-161 ◽  
Author(s):  
T. Bruhn ◽  
H. Mäder
Keyword(s):  
Internal Rotation ◽  
Microwave Spectrum ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

scholarly journals The microwave spectrum of 2-methylthiazole: 14N nuclear quadrupole coupling and methyl internal rotation

2020 ◽  
Vol 152 (13) ◽  
pp. 134306 ◽  
Author(s):  
Thuy Nguyen ◽  
Vinh Van ◽  
Claudine Gutlé ◽  
Wolfgang Stahl ◽  
Martin Schwell ◽  
...  
Keyword(s):  
Internal Rotation ◽  
Microwave Spectrum ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

Zum Mikrowellenspektrum des Isobutyronitrils

1967 ◽  
Vol 22 (4) ◽  
pp. 543-545 ◽  
Author(s):  
G. E. Herberich
Keyword(s):  
Lower Bound ◽  
Internal Rotation ◽  
Barrier Height ◽  
Microwave Spectrum ◽  
Coupling Constants ◽  
Methyl Groups ◽  
Kcal Mole ◽  
Rotational Constants ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

The microwave spectrum of isobutyronitrile has been investigated in the region from 5 — 30 GHz. A and C type transitions have been observed. No splittings due to internal rotation of the methyl groups could be detected and a lower bound of 2.6 kcal/mole for the barrier height is established.Values for the rotational constants are 7.940 95 ± 0.000 04, 3.968 039 ± 0.000 010 and 2.901 030 ± 0.000 010 GHz.The nuclear quadrupole coupling constants are χαα=—3.905±0.010 MHz, χbb=2.077±0.02 MHz and χcc=1.828±0.017 MHz.

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.

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