excess electron

excess electron

[′ek‚ses i′lek‚trän]
(solid-state physics)
Electron introduced into a semiconductor by a donor impurity and available for conduction.
References in periodicals archive ?
The excess electron will flow to nearby sites, designated cathodic sites at which they will be consumed by oxidizing species from the corrosive solution.
Implicit in the method is the requirement that the ordered part of the crystal structure has no excess electron density so that all excess electron density then necessarily resides in the voids.
When the excess electron migrates into bulk water, a local hydrogen-bonding network around the I atom and the excess electron change drastically due to reorientation of water molecules; [I.
The most natural and Occam's-razor-consistent conclusion to be drawn from (19), however, is that the excess electron (or electrons) in the reflected current is (are) coming from the right (z > 0) of the step at z = 0 and proceeding in the negative z direction away from the step.
Free radicals are molecules that have one excess electron or one less electron, and they try to steal or give electrons to other molecules, thereby changing their chemical structure.
of Basel, Switzerland) here presents nine articles on important aspects of charge transfer processes in DNA, including the principles and mechanisms of photoinduced charge injection, transport, and trapping in DNA; sequence-dependent dynamics as the regulator of DNA-mediated charge transport; excess electron transfer in DNA probed with flavin- and thymine dimmer-modified oligonucleotides; dynamics of photoinitiated hole and electron injection in duplex DNA; spectroscopic investigation of charge transfer in DNA; and electron transfer and structural dynamics in DNA.
David Coker (Boston) discussed his work on the surface hopping trajectory approach to nonadiabatic dynamics of excess electron relaxation in fluids that exhibit localized equilibrium solvated electron states and to electron ejection and trapping in glassy matrices.
You can see that microbes make nano wires to dump off excess electrons, Criddle added.
You can see that the microbes make nano-wires to dump off their excess electrons," said co-author Craig Criddle, a professor in the department of civil and environmental engineering.
So I have an excess of electrons on one side, and a depletion of excess electrons underneath my hands, so I have a voltage between the two which is called the thermal voltage.
The balloon-borne ATIC, or Advanced Thin Ionization Calorimeter, counted 70 excess electrons above the usual number expected from the galactic background.
However, the researchers overcame this by incorporating a PIN (P-type Insulator N-type) device into a waveguide to remove excess electrons from the light's path.