Chemistry: A complex formed from combination of a molecule with another molecule of the same type but in an → excited state. In other words, a → dimer in an electronically excited state. See also → exciplex.
For a → triangle with two sides extended in the direction opposite their common → vertex, a circle that lies outside the triangle and is tangent to the three sides (two of them extended). The center of the excircle, called the → excenter, is the point of intersection of the bisector of the interior angle and the bisector of the exterior angles at the other two vertices.
To cut out or off; to remove
The act of removal; an excising. The surgical removal of a foreign body or of tissue.
Verbal noun of → excise.
1) The addition of → energy to an → atomic
or → molecular system, → transferring it
from its → ground state to an
→ excited state.
Fr.: énergie d'excitation
Fr.: potentiel d'excitation
Fr.: température d'excitation
Of a gas or plasma, the temperature deduced from the → populations of atomic → excited states, as expressed by the Boltzmann formula: Nu/Nl = (gu/gl) exp (-ΔE/kTex), where Nu and Nl are the upper level and lower level populations respectively, gu and gl the statistical weights, ΔE = hν the energy difference between the states, k is → Boltzmann's constant, and h→ Planck's constant. The higher the energy of the occupied states, the higher the excitation temperature.
Verb of → excitation.
From L. excitare "to rouse, produce," freq. of exciere "to call forth, instigate," from → ex- "out" + ciere "to move, set in motion;" PIE base *kei- "to move to and fro" (cf. Av. šiyav-, š(ii)auu- "to move, go," šiyavati "goes," šyaoθna- "activity; action; doing, working;" O.Pers. šiyav- "to go forth, set," ašiyavam "I set forth;" Mod.Pers. šodan, šow- "to go; to become;" cf. Skt. cyu- "to move to and fro, shake about; to stir," cyávate "stirs himself, goes;" Gk. seuo "I start quickly after," kinein "to move;" Goth. haitan "call, be called;" O.E. hatan "command, call").
Barangixtan, from intensive prefix bar- "on, upon, up," → on-, + angixtan, angizidan "to excite, stimulate," from Mid.Pers. hangêxtan, hangêz- "to arouse, stimulate, stir up," from Proto-Iranian *hamgaiz-, from ham-, → com-, + *gaiz- "to disturb, stir, excite." The Mod.Pers. gij, giž "confused, astonished, dizzy" is from this stem (Cheung 2007).
atom-e barangixté (#)
Fr.: atome excité
An atom in which one or more of its bound electrons are at → energy levels higher than their normal level.
hâlat-e barangixté (#)
Fr.: état excité
The condition of a particle or system of particles (especially an atom, nucleus, molecule) after absorbing energy from outside and transiting to a higher → energy level than that of its → ground state. Excited states are transitory as they lose energy through emissions or collisions and return to ground state.
Fr.: étoile excitatrice
To shut or keep out; to hinder from being included, considered, or accepted. → exclusion.
An act or instance of excluding; the state of being excluded.
Verbal noun of → exclude.
Fr.: principe d'exclusion
Excluding or having power to exclude; excluding all else; rejecting other considerations, possibilities, etc.
Adj. from → exclude.
Fr.: disque d'excrétion
An expanding → equatorial → disk or → torus of material ejected by a star. The phenomenon may result from a stellar → merger or an increase in its rate of → rotation or → stellar winds. Contrasted with → accretion disk.