Laporte, O. (English spelling) LaporteO

Japanese: Laporte,O.(英語表記)LaporteO
Laporte, O. (English spelling) LaporteO


[Parity in quantum mechanics]
The concept of parity was originally introduced in quantum mechanics by the American Eugene Paul Wigner (1902-95) to demonstrate the transformability of the wave function Ψ(r1, r2, ..., rn ) of a certain level of an atom with respect to spatial inversion P , ( r1 , ..., rn ) = Ψ( -r1 , ..., -rn ) = ± Ψ( r1 , ..., rn ) . If the orbital angular momentum of each particle is l1 , l2 , ... in units of ħ (Planck's constant divided by 2π), then parity is: Otto Laporte of Germany discovered the rule that l i changes by odd numbers when an atom emits electric dipole radiation (Laporte's rule), and this can be used to classify atomic levels by parity. On the other hand, the parity of operators corresponding to physical quantities is defined in the same way as in classical mechanics.

*Some of the terminology that mentions "Laporte, O." is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:


[量子力学におけるパリティ]
 もともとパリティという概念は,量子力学において,原子のある準位の波動関数Ψ(r1r2,……,rn)の空間反転Pに対する変換性, PΨ(r1,……,rn)=Ψ(-r1,……,-rn)  =±Ψ(r1,……,rn)を示すために,アメリカのウィグナーEugene Paul Wigner(1902‐95)が導入したもので,各粒子の軌道角運動量をħ(プランク定数を2πで割ったもの)を単位としてl1,l2,……とすると,パリティはとなる。ドイツのラポルテOtto Laporteは原子からの電気二極放射に際し,liが奇数だけ変化するという規則を見いだしていたが(ラポルテの規則),これを用いれば原子の準位をパリティによって分類することができる。他方,物理量に対応する演算子のパリティは古典力学と同様に定義される。…

※「Laporte,O.」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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