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CORRIENTE TUNEL [2 records]
Record 1 - internal organization data 2014-07-28
Record 1, English
Record 1, Subject field(s)
- Scientific Instruments
- Atomic Physics
- Medical and Surgical Equipment
Record 1, Main entry term, English
- scanning tunneling microscope
1, record 1, English, scanning%20tunneling%20microscope
correct
Record 1, Abbreviations, English
- STM 2, record 1, English, STM
correct
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
The Scanning Tunneling Microscope (STM). The functional part of an STM consists of a metal tip, often tungsten, mounted on a piezoelectric tripod to allow motion in three dimensions. The tip, which is extremely sharp (ideally terminating in a single atom) is brought to within a few angstroms of a conducting sample surface. 2, record 1, English, - scanning%20tunneling%20microscope
Record number: 1, Textual support number: 1 PHR
Spin-polarized STM. 3, record 1, English, - scanning%20tunneling%20microscope
Record 1, Key term(s)
- scanning tunnelling microscope
Record 1, French
Record 1, Domaine(s)
- Instruments scientifiques
- Physique atomique
- Équipement médico-chirurgical
Record 1, Main entry term, French
- microscope à effet tunnel
1, record 1, French, microscope%20%C3%A0%20effet%20tunnel
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- microscope par effet tunnel 2, record 1, French, microscope%20par%20effet%20tunnel
masculine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
Le microscope à effet tunnel permet en général d'atteindre la résolution atomique sur des surfaces de métaux ou de semi-conducteurs. Une telle résolution demeure, par contre, exceptionnelle sur des matériaux plus «mous» tels que des polymères ou des objets d'intérêt biologique, pour lesquels d'ailleurs les mécanismes de conduction locale ne sont pas bien compris. 3, record 1, French, - microscope%20%C3%A0%20effet%20tunnel
Record number: 1, Textual support number: 1 PHR
Microscope à effet tunnel ultraminiaturisé. 4, record 1, French, - microscope%20%C3%A0%20effet%20tunnel
Record 1, Spanish
Record 1, Campo(s) temático(s)
- Instrumentos científicos
- Física atómica
- Equipo médico y quirúrgico
Record 1, Main entry term, Spanish
- microscopio de efecto túnel
1, record 1, Spanish, microscopio%20de%20efecto%20t%C3%BAnel
correct, masculine noun
Record 1, Abbreviations, Spanish
- STM 2, record 1, Spanish, STM
correct, masculine noun
Record 1, Synonyms, Spanish
Record 1, Textual support, Spanish
Record number: 1, Textual support number: 1 CONT
El microscopio de efecto túnel es un instrumento de gran importancia para el análisis superficial de materiales metálicos y semiconductores, esto debido a que fue el primer método de microscopía capaz de obtener resolución atómica de superficies, abriendo por tanto una nueva era para la microscopía en general. 3, record 1, Spanish, - microscopio%20de%20efecto%20t%C3%BAnel
Record number: 1, Textual support number: 2 CONT
A grandes rasgos, el principio [...] es muy simple : consiste en colocar con mucha precisión una punta afilada a muy poca distancia de la muestra, del orden de 0, 5 nm, y medir en cada caso una magnitud física fuertemente dependiente de la distancia entre ambos, que en el caso del STM es la corriente túnel que circula entre punta y muestra. 4, record 1, Spanish, - microscopio%20de%20efecto%20t%C3%BAnel
Record number: 1, Textual support number: 1 OBS
STM: por su sigla en inglés, "scanning tunneling microscope". 5, record 1, Spanish, - microscopio%20de%20efecto%20t%C3%BAnel
Record 2 - internal organization data 2014-04-16
Record 2, English
Record 2, Subject field(s)
- Atomic Physics
Record 2, Main entry term, English
- tunneling current
1, record 2, English, tunneling%20current
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, 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 2, English, - tunneling%20current
Record 2, French
Record 2, Domaine(s)
- Physique atomique
Record 2, Main entry term, French
- courant tunnel
1, record 2, French, courant%20tunnel
correct, masculine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 DEF
[...] courant généré par des électrons qui normalement n'auraient pas assez d'énergie pour circuler. 2, record 2, French, - courant%20tunnel
Record number: 2, 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 2, French, - courant%20tunnel
Record number: 2, 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 2, French, - courant%20tunnel
Record 2, Spanish
Record 2, Campo(s) temático(s)
- Física atómica
Record 2, Main entry term, Spanish
- corriente túnel
1, record 2, Spanish, corriente%20t%C3%BAnel
correct, feminine noun
Record 2, Abbreviations, Spanish
Record 2, Synonyms, Spanish
Record 2, Textual support, Spanish
Record number: 2, 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 2, Spanish, - corriente%20t%C3%BAnel
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