| 翻訳と辞書 |
| quantum beats ： ウィキペディア英語版 |
quantum beats
In physics, quantum beats are simple examples of phenomena that cannot be described by semiclassical theory, but can be described by fully quantized calculation, especially quantum electrodynamics. In semiclassical theory (SCT), there is an interference or beat note term for both V-type and -type atoms. However, in the quantum electrodynamic (QED) calculation, V-type atoms have a beat term but -types do not. This is strong evidence in support of quantum electrodynamics.
== Historical overview ==
The observation of quantum beats was first reported by A.T. Forrester, R.A. Gudmunsen and P.O. Johnson in 1955,〔A.T. Forrester, R.A. Gudmunsen, P.O. Johnson, Physical Review, vol. 99, pp. 1691–1700, 1955 ((abstract ))〕 in an experiment that was performed on the basis of an earlier proposal by A.T. Forrester, W.E. Parkins and E. Gerjuoy.〔A.T. Forrester, W.E. Parkins, E. Gerjuoy: ''On the possibility of observing beat frequencies between lines in the visible spectrum'', Physical Review, vol. 72, pp. 241–243, 1947〕 This experiment involved the mixing of the Zeeman components of ordinary incoherent light, that is, the mixing of different components resulting from a split of the spectral line into several components in the presence of a magnetic field due to the Zeeman effect. These light components were mixed at a photoelectric surface, and the electrons emitted from that surface then excited a microwave cavity, which allowed the output signal to be measured in dependence on the magnetic field.〔Edward Gerjuoy: ''Atomic physics'', In: H. Henry Stroke (ed.): ''The Physical Review—the First Hundred Years: A Selection of Seminal Papers and Commentaries'', Springer, 1995, ISBN 978-1-56396-188-5, pp. 83–102, (p. 97 )〕〔Paul Hartman: ''A Memoir on The Physical Review: A History of the First Hundred Years'', Springer, 2008, ISBN 978-1-56396-282-0, (p. 193 )〕
Since the invention of the laser, quantum beats can be demonstrated by using light originating from two different laser sources.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「quantum beats」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|