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The general parameter theorem ∂E/∂λ = (∂Ĥ/∂λ) for bound states of Ĥ is due to P. Güttinger, Z. Phys. 73, 169 (1932), cf. his eq. (11). It is later given by W. Pauli, in: Handbuch der Physik, Band XXIV, Teil 1, edited by H. Geiger and K. Scheel (Springer, Berlin, 1933), p. 162; reprinted in: Handbuch der Physik, Band V, Teil 1, edited by S. Flügge (Springer, Berlin, 1958), p. 83. λ can be any parameter (coupling constant, nuclear coordinate, . . .). For a coupling constant A and in lowest order of perturbation theory, the theorem was given already by E. Schrödinger, Ann. Phys. (Leipzig) [4], 80, 437 (1926), cf. his eq. (7''). The theorem is also implicitly contained in eq. (28) of the paper by M. Born and V.Fock, Z. Phys. 51, 165 (1928). -Hellmann and later Feynman explicitly referred to the special case of nuclear coordinates within the Born-Oppenheimer approximation, leading to the 'Hellmann-Feynman' forces upon nuclei: H. Hellmann, Einführung in die Quantenchemie (Deuticke, Leipzig, 1937), pp. 61, 285 (the original russian version is of 23 October 1936: G. Gel'man, Quantenchemie (ONTI, Moscow and Leningrad), p. 428) and R. P. Feynman, Phys. Rev. 56, 340 (1939). Hellmann stressed, that the forces calculated in this way sensitively depend on the electron density used therein. For variationally determined densities cf. S. T. Epstein, The Variation Method in Quantum Chemistry (Academic Press, New York, 1974). At degeneracies the theorem is discussed by O. E. Alon and L. S. Cederbaum, Phys. Rev. B 68, 033105 (2003). The Hellmann-Feynman theorem has been generalized to Gamow states by P. Ziesche, K. Kunze, and B. Milek, J. Phys. A 20, 2859 (1987).
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The general parameter theorem ∂E/∂λ = (∂Ĥ/∂λ) for bound states of Ĥ is due to P. Güttinger, Z. Phys. 73, 169 (1932), cf. his eq. (11). It is later given by W. Pauli, in: Handbuch der Physik, Band XXIV, Teil 1, edited by H. Geiger and K. Scheel (Springer, Berlin, 1933), p. 162; reprinted in: Handbuch der Physik, Band V, Teil 1, edited by S. Flügge (Springer, Berlin, 1958), p. 83. λ can be any parameter (coupling constant, nuclear coordinate, . . .). For a coupling constant A and in lowest order of perturbation theory, the theorem was given already by E. Schrödinger, Ann. Phys. (Leipzig) [4], 80, 437 (1926), cf. his eq. (7''). The theorem is also implicitly contained in eq. (28) of the paper by M. Born and V.Fock, Z. Phys. 51, 165 (1928). -Hellmann and later Feynman explicitly referred to the special case of nuclear coordinates within the Born-Oppenheimer approximation, leading to the 'Hellmann-Feynman' forces upon nuclei: H. Hellmann, Einführung in die Quantenchemie (Deuticke, Leipzig, 1937), pp. 61, 285 (the original russian version is of 23 October 1936: G. Gel'man, Quantenchemie (ONTI, Moscow and Leningrad), p. 428) and R. P. Feynman, Phys. Rev. 56, 340 (1939). Hellmann stressed, that the forces calculated in this way sensitively depend on the electron density used therein. For variationally determined densities cf. S. T. Epstein, The Variation Method in Quantum Chemistry (Academic Press, New York, 1974). At degeneracies the theorem is discussed by O. E. Alon and L. S. Cederbaum, Phys. Rev. B 68, 033105 (2003). The Hellmann-Feynman theorem has been generalized to Gamow states by P. Ziesche, K. Kunze, and B. Milek, J. Phys. A 20, 2859 (1987).
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The general parameter theorem ∂E/∂λ = (∂Ĥ/∂λ) for bound states of Ĥ is due to P. Güttinger, Z. Phys. 73, 169 (1932), cf. his eq. (11). It is later given by W. Pauli, in: Handbuch der Physik, Band XXIV, Teil 1, edited by H. Geiger and K. Scheel (Springer, Berlin, 1933), p. 162; reprinted in: Handbuch der Physik, Band V, Teil 1, edited by S. Flügge (Springer, Berlin, 1958), p. 83. λ can be any parameter (coupling constant, nuclear coordinate, . . .). For a coupling constant A and in lowest order of perturbation theory, the theorem was given already by E. Schrödinger, Ann. Phys. (Leipzig) [4], 80, 437 (1926), cf. his eq. (7''). The theorem is also implicitly contained in eq. (28) of the paper by M. Born and V.Fock, Z. Phys. 51, 165 (1928). -Hellmann and later Feynman explicitly referred to the special case of nuclear coordinates within the Born-Oppenheimer approximation, leading to the 'Hellmann-Feynman' forces upon nuclei: H. Hellmann, Einführung in die Quantenchemie (Deuticke, Leipzig, 1937), pp. 61, 285 (the original russian version is of 23 October 1936: G. Gel'man, Quantenchemie (ONTI, Moscow and Leningrad), p. 428) and R. P. Feynman, Phys. Rev. 56, 340 (1939). Hellmann stressed, that the forces calculated in this way sensitively depend on the electron density used therein. For variationally determined densities cf. S. T. Epstein, The Variation Method in Quantum Chemistry (Academic Press, New York, 1974). At degeneracies the theorem is discussed by O. E. Alon and L. S. Cederbaum, Phys. Rev. B 68, 033105 (2003). The Hellmann-Feynman theorem has been generalized to Gamow states by P. Ziesche, K. Kunze, and B. Milek, J. Phys. A 20, 2859 (1987).
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The general parameter theorem ∂E/∂λ = (∂Ĥ/∂λ) for bound states of Ĥ is due to P. Güttinger, Z. Phys. 73, 169 (1932), cf. his eq. (11). It is later given by W. Pauli, in: Handbuch der Physik, Band XXIV, Teil 1, edited by H. Geiger and K. Scheel (Springer, Berlin, 1933), p. 162; reprinted in: Handbuch der Physik, Band V, Teil 1, edited by S. Flügge (Springer, Berlin, 1958), p. 83. λ can be any parameter (coupling constant, nuclear coordinate, . . .). For a coupling constant A and in lowest order of perturbation theory, the theorem was given already by E. Schrödinger, Ann. Phys. (Leipzig) [4], 80, 437 (1926), cf. his eq. (7''). The theorem is also implicitly contained in eq. (28) of the paper by M. Born and V.Fock, Z. Phys. 51, 165 (1928). -Hellmann and later Feynman explicitly referred to the special case of nuclear coordinates within the Born-Oppenheimer approximation, leading to the 'Hellmann-Feynman' forces upon nuclei: H. Hellmann, Einführung in die Quantenchemie (Deuticke, Leipzig, 1937), pp. 61, 285 (the original russian version is of 23 October 1936: G. Gel'man, Quantenchemie (ONTI, Moscow and Leningrad), p. 428) and R. P. Feynman, Phys. Rev. 56, 340 (1939). Hellmann stressed, that the forces calculated in this way sensitively depend on the electron density used therein. For variationally determined densities cf. S. T. Epstein, The Variation Method in Quantum Chemistry (Academic Press, New York, 1974). At degeneracies the theorem is discussed by O. E. Alon and L. S. Cederbaum, Phys. Rev. B 68, 033105 (2003). The Hellmann-Feynman theorem has been generalized to Gamow states by P. Ziesche, K. Kunze, and B. Milek, J. Phys. A 20, 2859 (1987).
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