نتایج جستجو برای: asymmetric 13 dipolar

تعداد نتایج: 403606  

Journal: :Optics Express 2021

A single metallic nanodisk is the simplest plasmonic nanostructure, but it robust enough to generate a Fano resonance in forward and backward scattering spectra by increment of height symmetric asymmetric dielectric environment. Thanks phase retardation effect, non-uniform distribution electric field along aluminum (Al) generates out-of-plane higher-order modes, which interfere with dipolar mod...

Journal: :The Journal of chemical physics 2005
G Celebre G De Luca J W Emsley M Longeri D Merlet G Pileio N Suryaprakash

Partially averaged dipolar couplings (also referred to as residual dipolar couplings) D(ij) can be obtained from the analysis of the NMR spectra of molecules dissolved in liquid-crystalline solvents. Their values for a nonrigid molecule depend upon the bond lengths and angles, the rotational potentials, and the orientational order of the molecules. The molecule studied, 1-chloro-2-bromoethane, ...

Journal: :The Journal of chemical physics 2004
Giorgio Celebre Giuseppina De Luca Marcello Longeri Giuseppe Pileio James W Emsley

The proton NMR spectra of two (13)C-labeled isotopomers of styrene dissolved in two liquid crystalline solvents have been obtained and analyzed to yield four sets each of 24 dipolar couplings. These couplings were then used to investigate the structure of the ring and the ene fragments of the molecule, and the position of the maximum, phi(0), in the ring-ene bond rotational probability distribu...

Journal: :The Journal of chemical physics 2011
Gaël De Paëpe Józef R Lewandowski Antoine Loquet Matt Eddy Simon Megy Anja Böckmann Robert G Griffin

We describe a theoretical framework for understanding the heteronuclear version of the third spin assisted recoupling polarization transfer mechanism and demonstrate its potential for detecting long-distance intramolecular and intermolecular (15)N-(13)C contacts in biomolecular systems. The pulse sequence, proton assisted insensitive nuclei cross polarization (PAIN-CP) relies on a cross term be...

Journal: :Magnetic resonance in chemistry : MRC 2017
José A A França Armando Navarro-Vázquez Xinxiang Lei Han Sun Christian Griesinger Fernando Hallwass

The 1 H and 13 C NMR spectra of 17-α-ethinylestradiol (EE2), a well-known contraceptive, including diastereotopic methylene groups, were fully assigned with the help of residual dipolar couplings (RDC) measured in the recently developed grafted graphene oxide orienting medium. RDC analysis, which included all 1 DCH couplings and the long-range 2 DCH1 H-C≡13 C coupling, also pointed to the prese...

Journal: :Physical chemistry chemical physics : PCCP 2014
Christopher D Daub Per-Olof Åstrand Fernando Bresme

We use molecular dynamics simulations in applied thermal gradients to study thermomolecular orientation (TMO) of size-asymmetric dipolar dumbbells with different molecular dipole moments. We find that the direction of the TMO is the same as in apolar dumbbells of the same size, i.e. the smaller atom in the dumbbell tends to orient towards the colder temperature. The ratio of the electrical pola...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2005
William T Coffey Yuri P Kalmykov Sergey V Titov Jagdish K Vij

The longitudinal and transverse components of the complex dielectric susceptibility tensor of an assembly of dipolar molecules rotating in an asymmetric double-well potential are evaluated using a fractional rotational diffusion equation (based on the diffusion limit of a fractal time random walk) for the distribution function of orientations of the molecules on the surface of the unit sphere. ...

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