scholarly journals Quadrupole-Octupole Collectivity and Fine Structure of Nuclear Rotational Spectra

2002 ◽  
Vol 146 ◽  
pp. 597-598 ◽  
Author(s):  
Nikolay Minkov ◽  
Svetla Drenska
Keyword(s):  
Fine Structure ◽  
Rotational Spectra ◽  
Octupole Collectivity

scholarly journals Microwave Spectra of Dimethylether (CH3)2O and (CD3)2O in Excited Torsional States

1978 ◽  
Vol 33 (12) ◽  
pp. 1498-1510 ◽  
Author(s):  
H. Lutz ◽  
H. Dreizler
Keyword(s):  
Fine Structure ◽  
Excited States ◽  
Rotational Spectra ◽  
Microwave Spectra

Abstract The rotational spectra of the torsional excited states v̅n = 11,12,21, 22, 23 have been measured and assigned. The torsional fine structure was used to determine the coefficients V3 and V' 12 of the hindering potential. For (CH3)2O : V3 = 2618 ± 4 cal/mole, V'12 = 18 ± 8 cal/mole, for (CD3)2O : V3 = 2572 ± 6 cal/mole, V'12 = 29 ± 12 cal/mole, V12 was correlated to V3 .

Nuclear Quadrupole Hyperfine Structure and Methyl Torsional Fine Structure in the Rotational Spectra of N,N-Dimethylformamide and N-Nitrosodimethylamine

1993 ◽  
Vol 48 (4) ◽  
pp. 570-576 ◽  
Author(s):  
N. Heineking ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Fine Structure ◽  
Hyperfine Structure ◽  
Internal Rotation ◽  
Amino Nitrogen ◽  
Coupling Constants ◽  
Methyl Group ◽  
Rotational Spectra ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

Abstract The complicated nuclear quadrupole hyperfine structure and methyl torsional fine structure in the rotational spectra of N,N-dimethylformamide and N-nitrosodimethylamine have been studied using microwave Fourier transform spectroscopy. It has been found that both molecules are rather similar in terms of their parameters of methyl group internal rotation as well as in terms of their amino nitrogen quadrupole coupling constants.

Eine Analyse der Methyltorsionsfeinstruktur von Rotationsspektren in angeregten Zuständen der S-S-Torsion beim Trideutero-methyl-methyldisulfid / An Analysis of Methyltorsion Finestructure in Rotational Spectra of Excited States of S-S-Torsion of Trideutero-methyl-methyldisulfide

1974 ◽  
Vol 29 (9) ◽  
pp. 1335-1344 ◽  
Author(s):  
M. Kuhler ◽  
L. Charpentier ◽  
D. Sutter ◽  
H. Dreizier
Keyword(s):  
Fine Structure ◽  
Excited States ◽  
Degrees Of Freedom ◽  
Microwave Spectrum ◽  
Eine Analyse ◽  
Rotational Spectra ◽  
Methyl Torsion ◽  
Internal Degrees Of Freedom

The microwave spectrum of CH3SS CD3 was investigated in the range of 5 -40 GHz. Rotational spectra in different states of the S-S-torsion were assigned. The methyl torsion fine structure of these spectra was measured and compared with calculations based on a Hamiltonian formulated for a model with two internal degrees of freedom, the methyl and S-S-torsion.

rs-Struktur von Dimethylsulfoxid im Vergleich zur r0-Struktur

1969 ◽  
Vol 24 (2) ◽  
pp. 266-278 ◽  
Author(s):  
W. Feder ◽  
H. Dreizler ◽  
H. D. Rudolph ◽  
V. Typke
Keyword(s):  
Fine Structure ◽  
Dimethyl Sulfoxide ◽  
Substitution Method ◽  
Rotational Spectra ◽  
Isotopic Species ◽  
Limited Success ◽  
Double Substitution

From 9 microwave rotational spectra of 7 isotopic species of dimethyl sulfoxide the restructure of the molecule has been calculated. However, one H-atom is positioned so near a principal inertial plane that one coordinate could not be reliably determined. A special double substitution method aimed at improving this remaining coordinate was applied with limited success; r0-structure calcu­lations were performed and discussed based on differently chosen sets of isotopic spectra. The tor­sional fine structure due to the internal CH3-rotation was reanalyzed with improved structural para­meters.

Ein Beitrag zur Analyse der Torsionsfeinstruktur Rotationsspektren von Molekiilen mit zwei Methylgruppen / A Contribution to the Analysis of Rotational Spectra of Two-Top Molecules

1973 ◽  
Vol 28 (9) ◽  
pp. 1414-1421
Author(s):  
H. Dreizier ◽  
H. Legell
Keyword(s):  
Fine Structure ◽  
Hamiltonian Matrix ◽  
Invariance Group ◽  
Not Given ◽  
Numerical Treatment ◽  
Rotational Constants ◽  
Rotational Spectra ◽  
Van Vleck

The validity of the Hamiltonian usually used for the analysis of the torsional fine structure in rotational spectra of two-top molecules with the invariance group C3v-⊗C3v+ has been checked. The numerical treatment of the Hamiltonian matrix by Van Vleck transformation gives nearly the same result as the direct diagonalisation used in this work. For each torsional state a different set of rotational constants should be used to reproduce the torsional multiplet splittings. The spacing between the multiplets is not given. This fact, illustrated by dimethylsilane (CH3)2SiH2 as an example, demonstrates the limitation in the validity of the Hamiltonian.

Fine Structure of Platelet Interaction with a New Microcrystalline Collagen Preparation

1974 ◽  
Vol 32 ◽  
pp. 58-59
Author(s):  
W. H. Zucker ◽  
R. G. Mason
Keyword(s):  
Fine Structure ◽  
Platelet Aggregation ◽  
Hydrochloric Acid ◽  
Whole Blood ◽  
Platelet Adhesion ◽  
Hemostatic Agent ◽  
Native Collagen ◽  
Fibrillar Morphology ◽  
Clinical Interest ◽  
New Form

Platelet adhesion initiates platelet aggregation and is an important component of the hemostatic process. Since the development of a new form of collagen as a topical hemostatic agent is of both basic and clinical interest, an ultrastructural and hematologic study of the interaction of platelets with the microcrystalline collagen preparation was undertaken.In this study, whole blood anticoagulated with EDTA was used in order to inhibit aggregation and permit study of platelet adhesion to collagen as an isolated event. The microcrystalline collagen was prepared from bovine dermal corium; milling was with sharp blades. The preparation consists of partial hydrochloric acid amine collagen salts and retains much of the fibrillar morphology of native collagen.

Pituitary Follicular Cells: Their Origin, Possible Function and Fate

1974 ◽  
Vol 32 ◽  
pp. 34-35
Author(s):  
E. Horvath ◽  
K. Kovacs ◽  
G. Penz ◽  
C. Ezrin
Keyword(s):  
Fine Structure ◽  
Secretory Granules ◽  
Follicular Cells ◽  
Human Pituitary ◽  
Rat Pituitary ◽  
Pituitary Glands ◽  
Junctional Complexes

Follicular structures, in the rat pituitary, composed of cells joined by junctional complexes and possessing few organelles and few, if any, secretory granules, were first described by Farquhar in 1957. Cells of the same description have since been observed in several species including man. The importance of these cells, however, remains obscure. While studying human pituitary glands, we have observed wide variations in the fine structure of follicular cells which may lead to a better understanding of their morphogenesis and significance.

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