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CORRIENTE TUNEL [1 record]
Record 1 - internal organization data 2014-04-16
Record 1, English
Record 1, Subject field(s)
- Atomic Physics
Record 1, Main entry term, English
- tunneling current
1, record 1, English, tunneling%20current
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
In the STM [scanning tunneling microscope] the "aperture" is a tiny tungsten probe, its tip ground so fine that it may consist of only a single atom and measure just .2 nanometer in width. Piezoelectric controls maneuver the tip to within a nanometer or two of the surface of a conducting specimen so close that the electron clouds of the atom at the probe tip and of the nearest atom of the specimen overlap. When a small voltage is applied to the tip, electrons "tunnel" across the gap, generating a minuscule tunneling current. The strength of the current is exquisitely sensitive to the width of the gap; typically it decreases by a factor of 10 each time the gap is widened by .1 nanometer -half the diameter of an atom. 2, record 1, English, - tunneling%20current
Record 1, French
Record 1, Domaine(s)
- Physique atomique
Record 1, Main entry term, French
- courant tunnel
1, record 1, French, courant%20tunnel
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
[...] courant généré par des électrons qui normalement n'auraient pas assez d'énergie pour circuler. 2, record 1, French, - courant%20tunnel
Record number: 1, Textual support number: 1 OBS
Dans le cas de la microscopie à effet tunnel, les électrons ne devraient pas circuler entre le stylet et la surface. En pratique certains d'entre eux peuvent le faire, générant un courant. 2, record 1, French, - courant%20tunnel
Record number: 1, Textual support number: 2 OBS
Le terme tunnel est utilisé par analogie avec les tunnels classiques. Un tunnel permet à une automobile de traverser une montagne sans effort. Ici, l'électron n'a pas besoin de remonter la barrière d'énergie entre la pointe et la surface pour passer de l'une à l'autre. 2, record 1, French, - courant%20tunnel
Record 1, Spanish
Record 1, Campo(s) temático(s)
- Física atómica
Record 1, Main entry term, Spanish
- corriente túnel
1, record 1, Spanish, corriente%20t%C3%BAnel
correct, feminine noun
Record 1, Abbreviations, Spanish
Record 1, Synonyms, Spanish
Record 1, Textual support, Spanish
Record number: 1, Textual support number: 1 CONT
La corriente túnel es una función que varía de modo exponencial con la distancia. Esta dependencia exponencial hace que la técnica STM [microscopía de efecto túnel] tenga una alta sensibilidad, pudiéndose obtener imágenes con resoluciones de sub-angstrom. 1, record 1, Spanish, - corriente%20t%C3%BAnel
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