Der Zeemann-Effekt im Rotationsspektrum von 2-Fluoropyridin

1971 ◽  
Vol 26 (10) ◽  
pp. 1644-1657 ◽  
Author(s):  
D. Sutter
Keyword(s):  
Magnetic Susceptibility ◽  
Liquid Phase ◽  
Gas Phase ◽  
Crystalline Phase ◽  
Zeeman Effect ◽  
Short Description ◽  
Rotational Spectrum ◽  
Magnetic Susceptibility Anisotropy ◽  
Out Of Plane ◽  
Phase Out

Abstract The molecular Zeeman effect has been observed in the rotational spectrum of 2-fluoropyridine at magnetic fields close to 25000 G. The measured molecular g-values are gaa = -0.0880 ± 0.0007, gbb = - 0.0405 ±0.0006, gcc = + 0.0233 ±0.0006, and the two linearily independant components of the magnetic susceptibility anisotropy are 2 · χaa - χbb - χcc = 50.5 ± 1.6 and 2 · χbb - χcc - χaa - 53.8 ± 1.1 in units of 10-6 erg/G2 mol). The a-axis is close to the C-F-bond and the c-axis is perpendicular to the plane of the ring. A comparison of the gas-phase out-of-plane minus the average in-plane values for the susceptibilities of 2-fluoropyridine, pyridine, and fluorobenzene with the corresponding value for benzene in crystalline phase leads to the conclusion that the susceptibilities may change in the order of 10% when going from solid or liquid phase to the gasphase. A short description of the microwave-Zeeman spectrograph built at Kiel University is given. In the theoretical section expressions for the g-values and susceptibilities are derived which are more complete then those used up to now.

Magnetische Konstanten der Molekeln CuF und GaF / Magnetic Constants of the CuF and GaF Molecule

1974 ◽  
Vol 29 (12) ◽  
pp. 1919-1921
Author(s):  
R. Honerjäger ◽  
R. Tischer
Keyword(s):  
Magnetic Susceptibility ◽  
Vibrational State ◽  
Zeeman Effect ◽  
Rotational Constant ◽  
Magnetic Shielding ◽  
Rotational Spectrum ◽  
Magnetic Susceptibility Anisotropy ◽  
Ground Vibrational State ◽  
Microwave Rotational Spectrum

The Zeeman effect in the microwave rotational spectrum of 63Cu19F and 69Ga19F has been measured in the ground vibrational state υ = 0 in order to determine the (gJ-factor and the molecular magnetic susceptibility anisotropy ξT : 63Cu19F: gJ = -0.0628(2) ; ξT/h = 540(60) Hz/(kG)2 ; 69Ga19F: gJ = -0,06012(12) ; ξT/h = 521 (17) Hz/(kG)2. The molecular quadrupole moment and its electronic part are derived from the values of gJ,ξT and the rotational constant B0 . - The hyperfine structure of the Zeeman lines enabled a more or less rough determination of the magnetic shielding anisotropy of the nuclei 63Cu and 69Ga respectively:σT(63Cu) = -1760(830) · 10-6 , σT (69Ga) = - 386(165)·10-6.

scholarly journals The Rotational Zeeman Effect in Fluorobenzene and the Molecular Quadrupole Moment in Benzene

1982 ◽  
Vol 37 (10) ◽  
pp. 1165-1175 ◽  
Author(s):  
W. H. Stolze ◽  
M. Stolze ◽  
D. Hübner ◽  
D. H. Sutter
Keyword(s):  
Magnetic Susceptibility ◽  
Carbon Tetrachloride ◽  
Quadrupole Moment ◽  
Ring Current ◽  
Zeeman Effect ◽  
Electric Quadrupole ◽  
Quadrupole Moments ◽  
Electric Quadrupole Moment ◽  
Microwave Spectrometer ◽  
Out Of Plane

The rotational Zeeman effect in fluorobenzene is reinvestigated with a resolution improved by a factor of almost five to give more accurate g-tensor elements, magnetic susceptibility anisotropics and molecular electric quadrupole moments. The results fit into the pictures of a linear dependence of the out of plane molecular electric quadrupole moment, Qcc, on the number of fluorine substituents and of a linear correlation between the nonlocal (ring current) susceptibility, Χccnonlocal, and the CNDO/2-π-electron density alternation. They lead to a gasphase molecular electric quadrupole moment in benzene, Qcc,benzene = - (28.4 ± 4.7) · 10-40 Cm2 which is slightly less negative than the value deduced from electric field-gradient birefringence experiments on dilute benzene solutions with carbon tetrachloride as solvent. A detailed description of the high resolution microwave spectrometer is given in the appendix.

The Molecular Zeeman Effect in Selenophene

1972 ◽  
Vol 27 (11) ◽  
pp. 1691-1694 ◽  
Author(s):  
W. Czieslik ◽  
D. Sutter ◽  
H. Dreizler ◽  
C. L. Norris ◽  
S. L. Rock ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Zeeman Effect ◽  
Rotational Spectrum

Abstract The molecular Zeeman effect in the rotational spectrum of selenophene has been observed. The molecular g-values and the magnetic susceptibility anisotropics for selenophene 80Se are: gaa = -0.0849±0.0012, gbb= -0.0428±0.0011, gcc = + 0.365 ±0.0010, 2 Xaa-Xcc=50.15±0.80, 2 Xbb-Xcc-Zaa = 51.83 ± 1.3. From the comparison of the value ⊿X=2 Xcc-Xaa-Xbb in furan, thiophene and selenophene we conclude that the aromaticities of these molecules would be in the order: furan < thiophene ≌ selenophene.

The Molecular Zeeman Effect in 2-Methylfuran

1973 ◽  
Vol 28 (12) ◽  
pp. 1906-1910 ◽  
Author(s):  
W. Czieslik ◽  
U. Andresen ◽  
H. Dreizler
Keyword(s):  
Magnetic Susceptibility ◽  
Standard Deviation ◽  
Zeeman Effect ◽  
Methyl Group ◽  
Out Of Plane

The rotational Zeeman effect in 2-methylfuran has been measured and the results are compared with those of furan. The Zeeman parameters for the torsional A-species are gaa = -0.0704 ± 0.0005, gbb = -0.0335 ± 0.0004, gcc = +0.0253 ± 0.0005, 2 χaa - χbb - χcc = (23.6 ±0.9) · 10-6 erg/(G2 mole), 2 χbb - χaa - χcc = (44.2 ± 0.7) · 10-6 erg/(G2mole). The corresponding values of the torsional E-species agree with those of the A-species within twice the standard deviation.The out-of-plane minus the average in-plane components of the magnetic susceptibility, ⊿χ = χcc - 1/2 (χaa + χbb), for 2-methylfuran and furan are compared. The substitution of a methyl group for a proton in the 2-position of furan changes ⊿χ by + (4.8 ± 1.0) · 10-6 erg/(G2mole).

scholarly journals Molecular g-Values and Magnetic Susceptibility Anisotropy Parameters of D2-Ketene. Sign of the Dipole Moment of Ketene

1974 ◽  
Vol 29 (10) ◽  
pp. 1495-1497 ◽  
Author(s):  
K. V. L. N. Sastry ◽  
A. Guarnieri
Keyword(s):  
Magnetic Susceptibility ◽  
Dipole Moment ◽  
High Resolution ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Zeeman Effect ◽  
Magnetic Susceptibility Anisotropy ◽  
Anisotropy Parameters ◽  
G Factors

Abstract The rotational Zeeman-effect of D2CCO has been observed under high resolution. In addition to g-factors and susceptibility anisotropics the sign of the electric dipole moment has been determined after having remeasured the same parameters for normal ketene under identical conditions.

Molecular gᅩ-value, Magnetic Susceptibility Anisotropy, and Deuterium Quadrupole Coupling Constantin Deuterodiacetylene

1989 ◽  
Vol 44 (2) ◽  
pp. 89-94
Author(s):  
O. Böttcher ◽  
N. Heineking ◽  
M. Andolfatto ◽  
D. H. Sutter
Keyword(s):  
Magnetic Susceptibility ◽  
Coupling Effect ◽  
Zeeman Effect ◽  
Quadrupole Coupling Constant ◽  
Rotational Constant ◽  
Rotational Transition ◽  
Coupling Constant ◽  
Magnetic Susceptibility Anisotropy ◽  
Quadrupole Coupling ◽  
Constant E

Abstract The rotational Zeeman effect in the J′ → J = 2 → 1 rotational transition and the deuterium quadrupole coupling effect in the J′→J = 1 → 0 transition have been observed for D - C = C - C = C - H using a microwave Fourier transform (MWFT)-spectrometer.The molecular parameters determined are: rotational constant B0= 4084.452 MHz, deuterium quadrupole coupling constant e q Q (D) = 217(6) kHz, molecular gᅩ-value = 0.0073(1) and molecular magnetic susceptibility anisotropy (Xᅩ - X||) = 11.5(7) 10-6 erg G-2mol-1.

scholarly journals Hochtemperatur-Mikrowellenspektrometer für Zeeman-Effekt-Messungen an diamagnetischen Molekeln

1973 ◽  
Vol 28 (3-4) ◽  
pp. 458-463
Author(s):  
R. Honerjäger ◽  
R. Tischer
Keyword(s):  
Magnetic Susceptibility ◽  
High Temperature ◽  
Magnetic Fields ◽  
Zeeman Effect ◽  
Absorption Cell ◽  
Vibrational States ◽  
Magnetic Susceptibility Anisotropy ◽  
Strong Magnetic Fields ◽  
Upper Limit ◽  
Microwave Spectrometer

AbstractA high-temperature microwave spectrometer has been developed for Zeeman effect measurements in strong magnetic fields up to 50 kG. The absorption cell is placed in a superconducting solenoid and can be heated as high as 1200 °C. The gJ-factor and the magnetic susceptibility anisotropy of TIF, CsF and CsCl, the gJ-factor of CsBr, and an upper limit for the value of the gJ-factor of CsI have been measured. The molecules CsF and CsCl were also studied in higher vibrational states.

The Rotational Zeeman Effect of Pyrazole and Imidazole

1987 ◽  
Vol 42 (1) ◽  
pp. 49-56 ◽  
Author(s):  
M. Stolze ◽  
D. H. Sutter
Keyword(s):  
Magnetic Susceptibility ◽  
Angular Momentum ◽  
Ring Current ◽  
Zeeman Effect ◽  
Membered Ring ◽  
Ring Molecules ◽  
Isotopic Species ◽  
Out Of Plane ◽  
Additivity Rules ◽  
Single Standard

The rotational Zeeman effect of the most abundant isotopic species of pyrazole and of imidazole has been studied under Δ M= 0 and Δ M = ± 1 selection rules. With field close to 1.9 Tesla, the nuclear Zeeman effect uncouples the rotational angular momentum and the spins of the two nonequivalent 14N quadrupole nuclei. The observed g-tensor elements are gaa = - 0.07498(14), gbb = - 0.12531(13), and gcc = 0.06346(12) for pyrazole and gaa = - 0.09339(16), gbb = - 0.10444(14), and gcc= 0.06051(15) for imidazole. The values for the magnetic susceptibility anisotropies in units of 10-6 erg/(G2 mol) are 2Xaa - Xbb - Xcc = 39.53(24) and 2Xbb - Xcc - Xaa = 51.20(21) for pyrazole and 2xaa - Xbb - Xcc = 45.76(31) and 2Xbb - Xcc - Xaa = 42.19(41) for imidazole. (Given uncertainties are single standard deviations of the fit.) The so-called nonlocal (π-ring current) contributions to the out of plane components of the susceptibility tensor Xccnonlocal, derived as differences between the observed susceptibilities and values calculated from additivity rules for local atom susceptibilities, are compared to those derived earlier for other aromatic five membered ring molecules.

The Zeeman Effect in the Rotational Spectrum of Carbonyl Chloro Fluoride

1976 ◽  
Vol 31 (3-4) ◽  
pp. 369-373
Author(s):  
F. Scappini ◽  
A. Guarnieri
Keyword(s):  
Magnetic Susceptibility ◽  
Zeeman Effect ◽  
Rotational Spectrum ◽  
G Factors

The rotational Zeeman effect of FClCO is reported. The Chlorine nuclear gI-factor, the molecular g-factors, gaa , gbb , and gcc , and the magnetic susceptibility anisotropics, (2 χaa- χbb - χcc) mole and (2 χbb - χcc - χaa) mole, are obtained from the spectrum.Some derivative molecular quantities are calculated.

Sign in / Sign up

Export Citation Format

Share Document