An atomic population as the expectation
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R.F.W. Bader; P.F. Zou
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Article
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1992
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Elsevier Science
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English
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Dirac defines an observable to be a real dynamical variable with a complete set of eigenstates. It is shown that the density operatorb= Z, 6( i$ -r), is a quantum-mechanical observable whose expectation value is the particle density and that the integral form of this operator, the number operator fi