نتایج جستجو برای: electric field gradient
تعداد نتایج: 1000999 فیلتر نتایج به سال:
On the basis of simple heuristic models, we show that atomic electrons can (1) amplify fields observed at the nucleus, (2) generate harmonics, and (3) drive higher multipolarities. We consider a model with the nucleus at the focus of a uniformly charged ellipsoid. It amplifies an oscillating external electric field and produces an oscillating electricfield gradient but no higher derivatives. Th...
That is, the electric potential difference is the work that must be done, per unit charge, to move from to with no change in kinetic energy. Remember not to confuse electric potential energy ∆ which is in joules, and electric potential difference ∆ which is in units of = The electric field is perpendicular to equipotentials, that is lines of constant electric poten...
Introduction: Magnetic resonance imaging (MRI) is an important imaging technique to diagnose various diseases. However, patients with an implanted medical device, e.g. pacemakers, cannot benefit from this diagnostic modality. To analyze the adverse effects of MRI on patients with implants, various experimental studies have been performed [1]. It is observed that due to radiofrequency pulses, he...
We report on the observation of Bloch oscillations in light transport through periodic dielectric systems. By introducing a linear refractive index gradient along the propagation direction the optical equivalent of a Wannier-Stark ladder was obtained. Bloch oscillations were observed as time-resolved oscillations in transmission, in direct analogy to electronic Bloch oscillations in conducting ...
We report Magnetospheric Multiscale observations of electron pressure gradient electric fields near a magnetic reconnection diffusion region using a new technique for extracting 7.5 ms electron moments from the Fast Plasma Investigation. We find that the deviation of the perpendicular electron bulk velocity from E × B drift in the interval where the out-of-plane current density is increasing ca...
There is a concentration-polarization (CP) force acting on a particle submerged in an electrolyte solution with a concentration (conductivity) gradient under an externally applied DC electric field. This force originates from the two mechanisms: (i) gradient of electrohydrodynamic pressure around the particle developed by the Coulombic force acting on induced free charges by the concentration p...
Tip-enhanced Raman spectroscopy (TERS) with sub-nanometer spatial resolution has been recently demonstrated experimentally. However, the physical mechanism underlying is still under discussion. Here we theoretically investigate the electric field gradient of a coupled tip-substrate system. Our calculations suggest that the ultra-high spatial resolution of TERS can be partially attributed to the...
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