Nitrogen-14 nuclear quadrupole coupling and hydrogen fluoride (fluorine-19) nuclear spin-nuclear spin coupling in the microwave rotational spectrum of the acetonitrile-hydrogen fluoride dimer

1981 ◽  
Vol 85 (23) ◽  
pp. 3440-3443 ◽  
Author(s):  
P. D. Soper ◽  
A. C. Legon ◽  
W. G. Read ◽  
W. H. Flygare
Keyword(s):  
Hydrogen Fluoride ◽  
Nuclear Spin ◽  
Spin Coupling ◽  
Rotational Spectrum ◽  
Microwave Rotational Spectrum ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

scholarly journals Mikrowellenspektrum, Hinderungspotential der internen Rotation, Quadrupolkopplungskonstanten und Dipolmoment des 2-Methyl-Pyridins

1970 ◽  
Vol 25 (1) ◽  
pp. 25-35 ◽  
Author(s):  
H. Dreizler ◽  
H.D. Rudolph ◽  
H. Mäder
Keyword(s):  
Dipole Moment ◽  
Hyperfine Structure ◽  
Internal Rotation ◽  
Excited States ◽  
Stark Effect ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Microwave Rotational Spectrum ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

Abstract The microwave rotational spectrum of 2-methyl-pyridine (a-picoline) has been investigated in the region from 6 to 30 kmc/s. From the three lowest states of internal rotation m=0, 1, 2 the three-and sixfold components V3 and V6 of the potential barrier hindering the internal rotation have been determined to be V3= (258,4 ± 0,1) cal/mole and V6=(-11,8± 0,1) cal/mole. From the splitting of low-J lines m=0 the nuclear quadrupole coupling constants for the 14N nucleus have been derived as χaa= (-0,33 ± 0,02) mc/s, χbb = (-2,86 ± 0,02) mc/s, χcc = (+3,19 ± 0,02) mc/s. The hyperfine structure of rotational transitions in excited states of internal rotation could also be accounted for with these coupling constants. The dipole moment components derived from Stark-effect measurements in the ground torsional state m = 0 are μa = (0,72 ± 0,01) Debye and μb - (1,71 ± 0,02) Debye.

Hinderungspotential der internen Rotation, Dipolmoment und Quadrupolkopplungskonstanten aus dem Mikrowellenspektrum des 4-Methyl-Pyridins

1967 ◽  
Vol 22 (11) ◽  
pp. 1738-1743 ◽  
Author(s):  
H. D. Rudolph ◽  
H. Dreizler ◽  
H. Seiler
Keyword(s):  
Dipole Moment ◽  
Internal Rotation ◽  
Potential Barrier ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
A Value ◽  
Microwave Rotational Spectrum ◽  
Quadrupole Coupling ◽  
Substituted Toluenes ◽  
Nuclear Quadrupole

The microwave rotational spectrum of 4-methyl-pyridine (γ-picoline) has been investigated in the region from 8 to 37 GHz. The three types of lines to be expected for a molecule of this symmetry and with a very low sixfold barrier hindering internal rotation of the methyl top have been found: m=0; | m | ≠0, ≠ 3 n; | m |=3 n. From low-/ lines m=0 (a-type transitions) the rotational constants A′ (less methyl top) =6 082.145, B=2 524.850, C=1 783.991 MHz, the dipole moment μα=2.70 D, and the nuclear quadrupole coupling constants for the 14N nucleus χaa= —4.82, χbb—χcc= —2.8 MHz have been determined. From the wide splitting of the lines | m | = 3, | K | = 1 the potential barrier has been derived as V6=13.51 cal/mole, a value which is very close to those previously deduced for toluene and para-substituted toluenes.

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