作者: Aleksandr Sergeevich Davydov
DOI: 10.1007/978-1-4899-5169-4_2
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摘要: The steady internal states of atoms and molecules are characterized by discrete sets physical quantities (energy, angular momentum, parity, etc.), which have particular values in these states. In solids, due to the presence translational symmetry, one that characterize is real wave vector k (or quasi-momentum ħk).