Ligand electronegativity effect on the spin distribution in phosphoranyl radicals

1975 ◽  
Vol 97 (19) ◽  
pp. 5462-5464 ◽  
Author(s):  
Koichi Nishikida ◽  
Ffrancon Williams
Keyword(s):  
Spin Distribution ◽  
Electronegativity Effect

ChemInform Abstract: LIGAND ELECTRONEGATIVITY EFFECT ON THE SPIN DISTRIBUTION IN PHOSPHORANYL RADICALS

1975 ◽  
Vol 6 (48) ◽  
pp. no-no
Author(s):  
KOICHI NISHIKIDA ◽  
FFRANCON WILLIAMS
Keyword(s):  
Spin Distribution ◽  
Electronegativity Effect

Quantum-chemical analysis of small silver clusters

1987 ◽  
Vol 52 (7) ◽  
pp. 1652-1657 ◽  
Author(s):  
Grigorii V. Gadiyak ◽  
Yurii N. Morokov ◽  
Mojmír Tomášek
Keyword(s):  
Hard Spheres ◽  
Electronic Configuration ◽  
Close Packing ◽  
Basis Sets ◽  
Silver Clusters ◽  
Quantum Chemical Analysis ◽  
Spin Distribution ◽  
Spin Polarized ◽  
Atomic Silver ◽  
Equilibrium Geometries

Total energy calculations of three- and four-atomic silver clusters have been performed by the spin-polarized version of the CNDO/2 method to get the most stable equilibrium geometries, atomization energies, and charge and spin distribution on the atoms for three different basis sets: {s}, {sp}, and {spd}. When viewed from the equilateral triangle and square geometries, the last electronic configuration, i.e. the {spd} one, appears to be most stable with respect to the geometrical deformations considered. In this case, the behaviour of the atoms of both clusters resembles that of hard spheres (i.e. close-packing).

scholarly journals Electronic Structures of Purine Bases Studied by Electrochemical-ESR Techniques. Spin Distribution in Purine Anion Radical

1980 ◽  
Vol 53 (5) ◽  
pp. 1252-1256 ◽  
Author(s):  
Hiroaki Ohya-Nishiguchi ◽  
Yasunori Shimizu ◽  
Noboru Hirota ◽  
Kohji Watanabe
Keyword(s):  
Electronic Structures ◽  
Anion Radical ◽  
Spin Distribution ◽  
Purine Bases

Methyl Substitution as a Probe for π-Spin Distribution in the Radical Anion of 1,6-Methano[10]annulene

1976 ◽  
Vol 59 (4) ◽  
pp. 1371-1375 ◽  
Author(s):  
Fabian Gerson ◽  
Klaus Müllen ◽  
Christoph Wydler
Keyword(s):  
Radical Anion ◽  
Spin Distribution ◽  
Methyl Substitution

scholarly journals Three-Body Model Calculation of Spin Distribution in Two-Nucleon Transfer Reaction for the System of238U(18O,16O)240U Reaction

2011 ◽  
Vol 48 (10) ◽  
pp. 1337-1342 ◽  
Author(s):  
Kazuyuki OGATA ◽  
Shintaro HASHIMOTO ◽  
Satoshi CHIBA
Keyword(s):  
Model Calculation ◽  
Transfer Reaction ◽  
Spin Distribution ◽  
Nucleon Transfer ◽  
Body Model ◽  
Three Body

Paramagnetic Hexacyanometalates. The Diversity of Spin Distribution Studied by13C and15N MAS NMR Spectroscopy

2013 ◽  
Vol 52 (21) ◽  
pp. 12634-12644 ◽  
Author(s):  
Natalia Baumgärtel ◽  
Alexandrine Flambard ◽  
Frank H. Köhler ◽  
Rodrigue Lescouëzec
Keyword(s):  
Nmr Spectroscopy ◽  
Mas Nmr ◽  
Spin Distribution

scholarly journals CHIRAL QUARK MODEL (χQM) AND THE NUCLEON SPIN

2004 ◽  
Vol 19 (29) ◽  
pp. 5027-5041 ◽  
Author(s):  
HARLEEN DAHIYA ◽  
MANMOHAN GUPTA
Keyword(s):  
Angular Momentum ◽  
Magnetic Moments ◽  
Distribution Functions ◽  
Gluon Polarization ◽  
Spin Distribution ◽  
Polarization Functions ◽  
Singlet Component ◽  
Configuration Mixing ◽  
The Right ◽  
E866 Data

Using χ QM with configuration mixing, the contribution of the gluon polarization to the flavor singlet component of the total spin has been calculated phenomenologically through the relation [Formula: see text] as defined in the Adler–Bardeen scheme, where ΔΣ on the right-hand side is Q2 independent. For evaluation the contribution of gluon polarization [Formula: see text], ΔΣ is found in the χ QM by fixing the latest E866 data pertaining to [Formula: see text] asymmetry and the spin polarization functions whereas ΔΣ(Q2) is taken to be 0.30±0.06 and αs=0.287±0.020, both at Q2=5 GeV 2. The contribution of gluon polarization Δg' comes out to be 0.33 which leads to an almost perfect fit for spin distribution functions in the χ QM . When its implications for magnetic moments are investigated, we find perfect fit for many of the magnetic moments. If an attempt is made to explain the angular momentum sum rule for proton by using the above value of Δg', one finds the contribution of gluon angular momentum to be as important as that of the [Formula: see text] pairs.

scholarly journals NEA rotations and binaries

2006 ◽  
Vol 2 (S236) ◽  
pp. 167-176 ◽  
Author(s):  
Petr Pravec ◽  
A. W. Harris ◽  
B. D. Warner
Keyword(s):  
Binary Systems ◽  
Principal Axis ◽  
Spin Distribution ◽  
Rotation Periods ◽  
System A ◽  
Binary Formation ◽  
Basic Spin ◽  
Axis Rotation ◽  
Near Earth Asteroids ◽  
Abundant Population

AbstractOf the nearly 3900 near-Earth asteroids (NEAs) known as of June 2006, 325 have estimated rotation periods, with most of those determined by lightcurve analysis led by a few dedicated programs. NEAs with diameters down to 10 meters have been sampled. Observed spin distribution shows a major changing point around diameter of 200 meters. Larger NEAs show a barrier against spins faster than 11 d−1 (period about 2.2 h) that shifts to slower rates (longer periods) with increasing lightcurve amplitude (i.e., with increasing equatorial elongation). The spin barrier is interpreted as a critical spin rate for bodies in a gravity regime; NEAs larger than 200 meters are predominantly bodies with tensile strength too low to withstand a centrifugal acceleration for rotation faster than the critical spin rate. The cohesionless spin barrier disappears at sizes less than 200 meters where most objects rotate too fast to be held together by self-gravitation only, so a cohesion is implied in the smaller NEAs.The distribution of NEA spin rates in the cohesionless size range (D0.2 km) is highly non-Maxwellian, suggesting that mechanisms other than just collisions have been at work. There is a pile up just in front of the barrier, at periods 2–3 h. It may be related to a spin up mechanism crowding asteroids to the barrier. An excess of slow rotators is observed at periods longer than 30 hours. A spin-down mechanism has no obvious lower limit on spin rate; periods as long as tens of days have been observed.Most NEAs appear to be in their basic spin states with rotation around principal axis with maximum moment of inertia. Tumbling objects (i.e., bodies in excited, non-principal axis rotation) are present and actually predominate among slow rotators with estimated damping timescales longer than the age of the solar system. A few tumblers observed among fast rotating coherent objects appear to be either more rigid or younger than the larger (cohesionless) tumblers.An abundant population of binary systems has been found among NEAs. The fraction of binaries among NEAs larger than 0.3 km has been estimated to be 15 ± 4%. Primaries of binary systems concentrate at fast spin rates (periods 2–3 h) and low amplitudes, i.e., they lie just below the cohesionless spin barrier. The total angular momentum content in binary systems suggests that they formed from parent bodies spinning at the critical rate. The fact that a very similar population of binaries has been found among small main belt asteroids suggests a binary formation mechanism that may not be related to close encounters with the terrestrial planets.

Spatial spin distribution of a skyrmion in a two-dimensional electron gas at a smallg-factor

1998 ◽  
Vol 10 (9) ◽  
pp. 2029-2037 ◽  
Author(s):  
Yu A Bychkov ◽  
A V Kolesnikov ◽  
T Maniv ◽  
I D Vagner
Keyword(s):  
Electron Gas ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Spin Distribution ◽  
Dimensional Electron Gas
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