tunneling

tun·nel·ing (tŭnʹə-lĭng) n.
In quantum mechanics, the passing of a particle through a seemingly impenetrable barrier without a cause that is explainable by classical physics.

* * *

or barrier penetration

In physics, the passage of a particle through a seemingly impassable energy barrier.

Though a particle's energy may be too low to surmount a barrier in classical physics, the particle may still cross the barrier as a consequence of its quantum-mechanical wave properties. An important application of this phenomenon is in the operation of the scanning tunneling microscope.

* * *

also called  Barrier Penetration,  

      in physics, passage of minute particles through seemingly impassable force barriers. The phenomenon first drew attention in the case of alpha decay, in which alpha particles (nuclei of helium atoms) escape from certain radioactive atomic nuclei. Because nuclear constituents are held together by a force that the alpha particles have insufficient energy to overcome, their tunneling is contrary to the conventional understanding of classical physics and requires instead explanation in terms of quantum mechanics.

      On the basis of quantum mechanics, particles of subatomic size make their way across barriers even though their energies are too small to carry them over in the conventional way. Such particles follow the undulations of a quantum-mechanical (de Broglie) wave, accumulating where the wave grows and thinning out where it diminishes. Thus, the alpha particles, which seem to be tunneling through an impenetrable barrier, really penetrate it as a natural consequence of their wave properties.

* * *


Universalium. 2010.

Look at other dictionaries:

  • Tunneling — may refer to: * tunneling, on a violin or violia * Digging of tunnels (the literal meaning) * Mining, or tunneling during a siege * Quantum tunnelling, a quantum mechanical effect of transitioning through a classically forbidden energy state *… …   Wikipedia

  • tunneling —  Tunneling  Туннелирование (Туннельный эффект)   Эффект преодоления микрочастицей потенциального барьера в случае, когда полная энергия (после преодоления барьера) меньше высоты потенциального барьера. Туннельный эффект не может быть объяснен в… …   Толковый англо-русский словарь по нанотехнологии. - М.

  • Tunneling — Tunnel bzw. Tunneling bezeichnet den Gebrauch des Kommunikationsprotokolls eines Netzwerkdienstes als Transportmittel für Daten, die nicht zu diesem Dienst gehören. Die Tunnelsoftware wird sowohl auf dem Client als auch auf dem Server benötigt… …   Deutsch Wikipedia

  • Tunneling — La técnica de tunneling consiste en encapsular un protocolo de red sobre otro (protocolo de red encapsulador) creando un túnel dentro de una red de computadoras. El establecimiento de dicho túnel se implementa incluyendo una PDU determinada… …   Wikipedia Español

  • Tunneling — An illegal business practice in which a majority shareholder or high level company insider directs company assets or future business to themselves for personal gain. Actions such as excessive executive compensation, dilutive share measures, asset …   Investment dictionary

  • tunneling —    The encapsulation of one protocol within another, often used to transport a local area network protocol across a backbone that does not support that particular protocol.    Tunneling is also used to create pseudoconnections across… …   Dictionary of networking

  • Tunneling — Tunnel Tun nel, v. t. [imp. & p. p. {Tunneled}or {Tunnelled}; p. pr. & vb. n. {Tunneling} or {Tunnelling}.] [1913 Webster] 1. To form into a tunnel, or funnel, or to form like a tunnel; as, to tunnel fibrous plants into nests. Derham. [1913… …   The Collaborative International Dictionary of English

  • tunneling — tuneliavimas statusas T sritis fizika atitikmenys: angl. tunneling; tunnelling vok. Tunneln, n rus. туннелирование, n pranc. effet tunnel, m; passage tunnel, m …   Fizikos terminų žodynas

  • tunneling — noun or tunnelling ( s) Etymology: from gerund of tunnel (II) 1. : a tunnel or series of tunnels 2. : the act or process …   Useful english dictionary

  • Tunneling — Tunnel (réseau informatique) Pour les articles homonymes, voir Tunnel (homonymie). Un tunnel, dans le contexte de réseaux informatiques, est une encapsulation de données d un protocole réseau dans un autre, situé dans la même couche du modèle en… …   Wikipédia en Français

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.