Gas Phase Spin Relaxation of ZX3Y Molecules in the Dipolar Approximation

1975 ◽  
Vol 53 (7) ◽  
pp. 723-738 ◽  
Author(s):  
B. C. Sanctuary ◽  
R. F. Snider
Keyword(s):  
Kinetic Theory ◽  
Gas Phase ◽  
Magnetic Relaxation ◽  
Dipolar Coupling ◽  
Point Group ◽  
Group Symmetry ◽  
Subsequent Paper ◽  
Point Group Symmetry ◽  
Proper Treatment ◽  
Gas Kinetic Theory

The gas kinetic theory of nuclear magnetic relaxation of a polyatomic gas, as formulated in the previous paper, is evaluated for ZX3Y molecules relaxing via a dipolar coupling Hamiltonian. Stress is given to a proper treatment of point group symmetry, here C3v, and the possibility of molecular inversion is included. The detailed formula for the spin traces is however restricted to X nuclei with spin 1/2. A subsequent paper uses these results to elucidate the structure of the high density dependence of T1 forCF3H.

Atomic transport via point defects in crystals. IV. Anelastic relaxation

1986 ◽  
Vol 406 (1830) ◽  
pp. 107-113 ◽  
Keyword(s):  
Kinetic Theory ◽  
Dielectric Relaxation ◽  
Point Defects ◽  
Point Group ◽  
Relaxation Times ◽  
Group Symmetry ◽  
Point Group Symmetry ◽  
Atomic Transport ◽  
Relaxation Modes ◽  
Defect Reactions

The previously formulated kinetic theory of isothermal atomic transport via point defects is here applied to the description of anelastic relaxation in crystals containing defect pairs. Defect reactions leading to the dissociation and reformation of these pairs are included, but the symmetry and elastic strengths of the relaxation modes are unaffected, with the exception of modes having the full point-group symmetry of the crystal. In this respect anelastic relaxation is different from dielectric relaxation, the strength of which can be substantially affected by these reactions for reasons connected with the contributions which the dissociated defects make to the total measured electric current. The characteristic relaxation times associated with the elastically active modes are, however, shortened by these reactions.

scholarly journals Spin-reversal energy barriers of 305 K for Fe2+ d6 ions with linear ligand coordination

Nanoscale ◽  
2017 ◽  
Vol 9 (30) ◽  
pp. 10596-10600 ◽  
Author(s):  
Lei Xu ◽  
Ziba Zangeneh ◽  
Ravi Yadav ◽  
Stanislav Avdoshenko ◽  
Jeroen van den Brink ◽  
...  
Keyword(s):  
Solid State ◽  
Magnetic Anisotropy ◽  
Point Group ◽  
Group Symmetry ◽  
Point Group Symmetry ◽  
State Matrix ◽  
Magnetic Anisotropy Energy ◽  
Spin Reversal ◽  
Ligand Coordination ◽  
Li Ion

A remarkably large magnetic anisotropy energy of 305 K is computed by quantum chemistry methods for divalent Fe2+ d6 substitutes at Li-ion sites with D6h point-group symmetry within the solid-state matrix of Li3N.

Tunable double Weyl phonons driven by chiral point group symmetry

2021 ◽  
Vol 103 (10) ◽  
Author(s):  
Y. J. Jin ◽  
Z. J. Chen ◽  
X. L. Xiao ◽  
H. Xu
Keyword(s):  
Point Group ◽  
Group Symmetry ◽  
Point Group Symmetry

scholarly journals Dodecaallylhexasilacyclohexane

IUCrData ◽  
2017 ◽  
Vol 2 (6) ◽  
Author(s):  
Yoshiyuki Mizuhata ◽  
Yamato Omatsu ◽  
Norihiro Tokitoh
Keyword(s):  
Title Compound ◽  
Point Group ◽  
Chair Conformation ◽  
Group Symmetry ◽  
Point Group Symmetry ◽  
Compound C

The molecule of the title compound, C36H60Si6, exhibits point group symmetryCi, with the centre of inversion located at the centre of the Si6ring. The Si6ring has a chair conformation. In the crystal, molecules are linkedviaC—H...π(allyl) interactions.

scholarly journals Synthesis, structure determination and characterization by UV–Vis and IR spectroscopy of bis(diisopropylammonium) cis-dichloridobis(oxalato-κ2 O 1,O 2)stannate(IV)

2019 ◽  
Vol 75 (6) ◽  
pp. 742-745
Author(s):  
Bougar Sarr ◽  
Abdou Mbaye ◽  
Cheikh Abdoul Khadir Diop ◽  
Mamadou Sidibe ◽  
Yoann Rousselin
Keyword(s):  
Crystal Structure ◽  
Metal Ion ◽  
Point Group ◽  
Chain Structure ◽  
Chloride Ions ◽  
Group Symmetry ◽  
Point Group Symmetry ◽  
Chloride Dihydrate ◽  
Distorted Octahedral Coordination ◽  
Distorted Octahedral

The organic–inorganic title salt, (C6H16N)2[Sn(C2O4)2Cl2] or ( i Pr2NH2)2[Sn(C2O4)2Cl2], was obtained by reacting bis(diisopropylammonium) oxalate with tin(IV) chloride dihydrate in methanol. The SnIV atom is coordinated by two chelating oxalate ligands and two chloride ions in cis positions, giving rise to an [Sn(C2O4)2Cl2]2− anion (point group symmetry 2), with the SnIV atom in a slightly distorted octahedral coordination. The cohesion of the crystal structure is ensured by the formation of N—H...O hydrogen bonding between (iPr2NH2)+ cations and [SnCl2(C2O4)2]2− anions. This gives rise to an infinite chain structure extending parallel to [101]. The main inter-chain interactions are van der Waals forces. The electronic spectrum of the title compound displays only one high intensity band in the UV region assignable to ligand–metal ion charge-transfer (LMCT) transitions. An IR spectrum was also recorded and is discussed.

Pseudo-symmetry in multiple twinned crystals having M3M point group symmetry

1971 ◽  
Vol 2 (12) ◽  
pp. 3485-3486 ◽  
Author(s):  
Santiago Harriague ◽  
Harry A. Leibovich
Keyword(s):  
Point Group ◽  
Group Symmetry ◽  
Point Group Symmetry

Symmetry adaptation and the utilization of point group symmetry in valence bond calculations, including CASVB

1997 ◽  
Vol 95 (3-4) ◽  
pp. 131-150 ◽  
Author(s):  
Thorstein Thorsteinsson ◽  
David L. Cooper ◽  
Joseph Gerratt ◽  
Mario Raimondi
Keyword(s):  
Point Group ◽  
Valence Bond ◽  
Group Symmetry ◽  
Point Group Symmetry ◽  
Symmetry Adaptation
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