Supplementary remark on my previous note “velocity of the dirac electron”
説明
In a previous note (1) concerned with the velocity cingenvalues of the Dirac eleetron, the mechanism was analyzed by which a Dirac wave packet representing a simultaneous eigenstate of position and velocity travels with the light ve lo city during a very short interval. As a supplementary remark to this note I should like to point out that two successive of the position, if performed within a time very short compared with the reciprocal Compton frequency, t~-~/mc 2, would indeed lead to an eigenstate of the corresponding component of the velocity operator. Thus it turns out that the procedure of the velocity measurement described in Dirac's t~xt-book (2), is justified under the above-mentioned limitation. (As I remarked before, it appeared quite dtibious at first sight, but a more detailed examination has witnessed its correctneus, which is essentially due to the peculiar behaviour of a relativistic wave packet immediately after an ideal position determination.) It is quite doubtful whether a quan-
収録刊行物
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- Il Nuovo Cimento
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Il Nuovo Cimento 3 214-215, 1956-01-01
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