ChemInform Abstract: THE GENERATION AND TRAPPING OF THE HIGH-TEMPERATURE OXOSILYLIUMYL CATION RADICALS (28SIO+ AND 29SIO+) IN NEON MATRIXES AT 4 K; AN ESR AND AB INITIO CI THEORETICAL INVESTIGATION

1985 ◽  
Vol 16 (42) ◽  
Author(s):  
L. B. JUN. KNIGHT ◽  
A. LIGON ◽  
R. W. WOODWARD ◽  
D. FELLER ◽  
E. R. DAVIDSON
Keyword(s):  
High Temperature ◽  
Ab Initio ◽  
Theoretical Investigation ◽  
Cation Radicals

Fluorobenzene and p-difluorobenzene microsolvated by methanol: An infrared spectroscopic and ab initio theoretical investigation

2000 ◽  
Vol 112 (4) ◽  
pp. 1844-1858 ◽  
Author(s):  
K. Buchhold ◽  
B. Reimann ◽  
S. Djafari ◽  
H.-D. Barth ◽  
B. Brutschy ◽  
...  
Keyword(s):  
Ab Initio ◽  
Theoretical Investigation ◽  
Infrared Spectroscopic

Magnetic anisotropy on demand exploiting high-pressure as remote control: an ab initio proof-of-concept

2021 ◽  
Author(s):  
Matteo Briganti ◽  
Federico Totti
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Remote Control ◽  
Magnetic Anisotropy ◽  
Ab Initio ◽  
Single Molecule ◽  
Boiling Temperature ◽  
Proof Of Concept ◽  
Single Molecule Magnets ◽  
On Demand

Lanthanide based single molecule magnets have recently become very promising systems for creating single molecule device working at high temperature (nitrogen boiling temperature). However, the variation of direction of the...

Theoretical investigation on spin-forbidden cooling transitions of gallium hydride

2017 ◽  
Vol 19 (36) ◽  
pp. 24647-24655 ◽  
Author(s):  
Yun-Guang Zhang ◽  
Hua Zhang ◽  
Hai-Yang Song ◽  
You Yu ◽  
Ming-Jie Wan
Keyword(s):  
Quantum Chemistry ◽  
Ab Initio ◽  
Theoretical Investigation ◽  
Laser Cooling ◽  
Gallium Hydride

The feasibility of laser cooling of gallium hydride is investigated using ab initio quantum chemistry.

scholarly journals Study of High-Temperature Behaviour of ZnO by Ab Initio Molecular Dynamics Simulations and X-ray Absorption Spectroscopy

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5206
Author(s):  
Dmitry Bocharov ◽  
Inga Pudza ◽  
Konstantin Klementiev ◽  
Matthias Krack ◽  
Alexei Kuzmin
Keyword(s):  
Molecular Dynamics ◽  
High Temperature ◽  
Ab Initio ◽  
Ab Initio Molecular Dynamics ◽  
Mean Square ◽  
Structural Anisotropy ◽  
X Ray ◽  
Temperature Dependences ◽  
Dynamics Simulations ◽  
X Ray Absorption

Wurtzite-type zinc oxide (w-ZnO) is a widely used material with a pronounced structural anisotropy along the c axis, which affects its lattice dynamics and represents a difficulty for its accurate description using classical models of interatomic interactions. In this study, ab initio molecular dynamics (AIMD) was employed to simulate a bulk w-ZnO phase in the NpT ensemble in the high-temperature range from 300 K to 1200 K. The results of the simulations were validated by comparison with the experimental Zn K-edge extended X-ray absorption fine structure (EXAFS) spectra and known diffraction data. AIMD NpT simulations reproduced well the thermal expansion of the lattice, and the pronounced anharmonicity of Zn–O bonding was observed above 600 K. The values of mean-square relative displacements and mean-square displacements for Zn–O and Zn–Zn atom pairs were obtained as a function of interatomic distance and temperature. They were used to calculate the characteristic Einstein temperatures. The temperature dependences of the O–Zn–O and Zn–O–Zn bond angle distributions were also determined.

Preparation, 1H and 13C NMR, and ab initio/IGLO study of mono-O-protonated deltic acid and theoretical investigation of di-, tri-, and tetra-O-protonated deltic acids

1999 ◽  
Vol 77 (5-6) ◽  
pp. 525-529 ◽  
Author(s):  
GK Surya Prakash ◽  
Golam Rasul ◽  
George A Olah ◽  
Ronghua Liu ◽  
Thomas T Tidwell
Keyword(s):  
Nmr Spectroscopy ◽  
Ab Initio ◽  
Theoretical Investigation ◽  
13C Nmr ◽  
Chemical Shifts ◽  
1H And 13C Nmr ◽  
Nmr Chemical Shifts ◽  
Molar Solution ◽  
Protonated Species ◽  
C Nmr

The hitherto elusive mono-O-protonated deltic acid C3O3H3+ was prepared by protolysis of di-tert-butoxy deltate in FSO3H-SO2ClF and in FSO3H:SbF5 (Magic Acid; 1:1 molar solution) in SO2ClF as solvent at -78°C and was characterized by 1H and 13C NMR spectroscopy. The structure and NMR chemical shifts were also calculated by the ab initio/IGLO method. No NMR evidence was found for persistent di-O-protonated deltic acid under these conditions, although a limited equilibrium with the mono-O-protonated species can be involved. Di-, tri-, and tetra-O-protonated deltic acids were also studied by ab initio/IGLO method.Key words: protonated deltic acid, aromaticity, superacids, NMR spectroscopy, ab initio and IGLO calculations.

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