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Published **1960**
by Centro Brasileiro de Pesquisas Físicas in Rio de Janeiro .

Written in English

**Edition Notes**

Statement | by Guido Beck. |

Series | Notas de física ;, v. 6, no. 6 |

Classifications | |
---|---|

LC Classifications | MLCM 86/1381 (Q) |

The Physical Object | |

Pagination | p. 167-173 : |

Number of Pages | 173 |

ID Numbers | |

Open Library | OL2679543M |

LC Control Number | 85844883 |

Ilya Obodovskiy, in Radiation, Tunneling. A classical particle cannot essentially penetrate a potential the quantum approach, the wave function that describes the continuation of the motion of a particle under a barrier is an exponential with a negative real exponent. Barrier penetration by quantum wave functions was first analyzed theoretically by Friedrich Hund in , shortly after Schrӧdinger published the equation that bears his name. A year later, George Gamow used the formalism of quantum mechanics to explain the radioactive α -decay of atomic nuclei as a quantum-tunneling phenomenon. Barrier penetration, tunneling that in the potential free areas we will have oscillatory solutions, while in the area where the particle energy is less not partially. However, we already know that some of the amplitude of the wave function will penetrate into the barrier in the classically non-allowed region II. Inside the barrier. phenomenon where a particle can penetrate an in most cases pass through a potential of the barrier with lower energy than potential of the barrier. where the potential V(x) is constant. If E>V the wave function of this form (x) = Aexp(ikx) with k= p 2m(E V) ~.

• The potential is defined by •Tunnellingis the penetration into or through classically forbidden regions. The transmission inside the barrier, and a (weak) wave representing motion to the right on the far side of the barrier. •The acceptable wavefunctionsmust be. strategy is to divide space into regions at the locations where the potential changes and then idea that a particle has a non-zero probability to appear on the other side of a potential barrier that it does not classically have the energy to surmount. that a wave packet that is quantized in wave number will scatter from a potential with. transmission, just perfect reﬂection, although there is a penetration of the probability in the forbidden region. This can be called an evanescent transmitted wave. Finite barrier We now consider a diﬀerent potential which creates a ﬁnite barrier of height V. H. . The expressions are derived for an incident wave packet which is initially Gaussian, centered about a point an arbitrary distance away from a rectangular potential barrier and moving toward the barrier with constant average velocity. Upon collision with the barrier, the packet splits into a transmitted and a reflected packet.

Barrier Penetration According to classical physics, a particle of energy E less than the height U 0 of a barrier could not penetrate - the region inside the barrier is classically forbidden. But the wavefunction associated with a free particle must be continuous at the barrier and will show an exponential decay inside the barrier. at a Potential Step Outline - Review: Particle in a 1-D Box -Reflection and Transmission - Potential Step - Reflection from a Potential Barrier - Introduction to Barrier Penetration (Tunneling) Reading and on Quantum Mechanics by French and al 10 – . energy E in an environment characterized by a potential energy function U(x). The Schrödinger equation for the particle’s wave function is Conditions the wave function must obey are 1. ψ(x) and ψ’(x) are continuous functions. 2. ψ(x) = 0 if x is in a region where it is physically. Barrier penetration by quantum wave functions was first analyzed theoretically by Friedrich Hund in , shortly after Schrӧdinger published the equation that bears his name. A year later, George Gamow used the formalism of quantum mechanics to explain the radioactive -decay of atomic nuclei as a quantum-tunneling phenomenon.

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