TERMIUM Plus®

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SOURCE IONISATION ETINCELLES [1 record]

Record 1 1989-11-15

English

Subject field(s)
  • Physics of Solids
  • Scientific Instruments
OBS

... ion sources fall into three major categories: ... for positive-ion generation, ... for negative ion generation, and a highly specialized type of source designed to produce a polarized ion beam.... The principal methods of positive-ion formation are electron impact, surface ionization, spark discharge ... [in this Patter technique] a spark is induced between two electrodes, one of which, at least, contains the element to be ionized ... the spark consists of a high density, high-temperature plasma from which ions can be extracted.

French

Domaine(s)
  • Physique des solides
  • Instruments scientifiques
CONT

L'ionisation par étincelles est utilisée pour l'analyse élémentaire des solides minéraux conducteurs de l'électricité ou rendus tels. Avec le matériau dont on veut connaître la composition, on réalise [...] deux électrodes [...] reliées, sous vide, aux bornes d'un générateur haute fréquence [...] et haute tension [...] Lorsque la distance inter-électrodes [...] diminue, des claquages apparaissent; ils produisent [...] un grand nombre d'ions mono et polychargés [...] Ces ions sont accélérés et dirigés vers un spectromètre; [...]

Spanish

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