It is pointed out that the recent calculations of the absorbing power due to a photon exciting both a plasmon and a photon in an electron gas are incorrect. The error is shown to result from the inconsistent (current non-conserving) treatment of the electron-electron (or electron-plasmon) interaction. The corresponding correct result should give essentially zero contribution owing to the requirement of the conservation law.
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Mitsuo Watabe (1970) studied this question.
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