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elements Dipole approximation matrix element Dipole matrix element Dipole moment matrix element Dipole transition matrix element Dirac delta function matrix elements Direction cosine matrix elements Doubly reduced matrix element ELEMENTS OF THE g MATRIX Effective interactions matrix elements Electric dipole Matrix element Electric dipole moment, component matrix element Electron coupling matrix element Electron density matrix elements Electron density matrix elements transferability Electron matrix elements Electron propagator spin matrix elements Electron transfer matrix element Electron-phonon matrix elements Electron-vibrational matrix elements Electronic Wavefunctions and Calculation of Matrix Elements Electronic coupling matrix elements Electronic matrix elements for Electronic model, matrix elements Electronic overlap matrix element Electronic wavefunctions matrix elements between Electrostatic interaction matrix elements Element Connectivity Matrix Element of a matrix Element 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