On Rüdenberg's integral approximations and their unrestricted and combined use in molecular orbital theories of Hartree-Fock type

Rüdenberg's well‐known letter of 1951 contains two implications which still have not been employed so far in numerical computations: (1) Whenever all types of attraction and repulsion integrals are subject to the Rüdenberg approximations in its simplest form partially known already from Mullike...

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Published inInternational journal of quantum chemistry Vol. 76; no. 2; pp. 148 - 160
Main Author Koch, Wolfhard
Format Journal Article
LanguageEnglish
Published New York John Wiley & Sons, Inc 15.01.2000
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ISSN0020-7608
1097-461X
DOI10.1002/(SICI)1097-461X(2000)76:2<148::AID-QUA5>3.0.CO;2-R

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Abstract Rüdenberg's well‐known letter of 1951 contains two implications which still have not been employed so far in numerical computations: (1) Whenever all types of attraction and repulsion integrals are subject to the Rüdenberg approximations in its simplest form partially known already from Mulliken, the attractive, the Coulomb, as well as the exchange part of the restricted Hartree–Fock–Roothaan equation can be led back to the calculation of corresponding diagonal elements, only. Using Rüdenberg's more elaborate concepts, which are invariant with respect to the rotation of local coordinate axes, the complete Fock‐matrix representation can be constructed equivalently from only its own diagonal blocks, each belonging to one atom. Similar formulas are valid for the unrestricted Hartree–Fock theory of Pople and Nesbet. (2) If, however, one prefers to calculate all types of one‐ and two‐center integrals exactly as suggested in Rüdenberg's headline, the original simplicity of both representations is lost. Instead, one is led to more complicated expressions, which arise from the fact that Rüdenberg's integral formulas, when applied to certain kinds of three‐center repulsion integrals, imply considerable oversimplifications. In spite of this critical result, Rüdenberg's ideas offer an extension together with an interpretation of the semiempirical Wolfsberg and Helmholz recipe (better known from Hoffmann's “extended Hückel” theory), on the one hand, and of the “neglect of differential overlap” schemes ZDO and NDDO, on the other, from a common point of view. © 2000 John Wiley & Sons, Inc. Int J Quant Chem 76: 148–160, 2000
AbstractList Rüdenberg's well‐known letter of 1951 contains two implications which still have not been employed so far in numerical computations: (1) Whenever all types of attraction and repulsion integrals are subject to the Rüdenberg approximations in its simplest form partially known already from Mulliken, the attractive, the Coulomb, as well as the exchange part of the restricted Hartree–Fock–Roothaan equation can be led back to the calculation of corresponding diagonal elements, only. Using Rüdenberg's more elaborate concepts, which are invariant with respect to the rotation of local coordinate axes, the complete Fock‐matrix representation can be constructed equivalently from only its own diagonal blocks, each belonging to one atom. Similar formulas are valid for the unrestricted Hartree–Fock theory of Pople and Nesbet. (2) If, however, one prefers to calculate all types of one‐ and two‐center integrals exactly as suggested in Rüdenberg's headline, the original simplicity of both representations is lost. Instead, one is led to more complicated expressions, which arise from the fact that Rüdenberg's integral formulas, when applied to certain kinds of three‐center repulsion integrals, imply considerable oversimplifications. In spite of this critical result, Rüdenberg's ideas offer an extension together with an interpretation of the semiempirical Wolfsberg and Helmholz recipe (better known from Hoffmann's “extended Hückel” theory), on the one hand, and of the “neglect of differential overlap” schemes ZDO and NDDO, on the other, from a common point of view. © 2000 John Wiley & Sons, Inc. Int J Quant Chem 76: 148–160, 2000
Author Koch, Wolfhard
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Dedicated to Professor Klaus Rüdenberg.
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References Rüdenberg, K. J Chem Phys 1951, 19, 1433.
(a) Billingsley, F. P., II; Bloor, J. E. Chem Phys Lett 1969, 4, 48.
Cook, D. B. Structures and Approximations for Electrons in Molecules; Ellis Horwood, Chichester, 1978.
(e) Newton, M. D.; Lathan, W. A.; Hehre, W. J.; Pople, J. A. J Chem Phys 1969, 51, 3927.
(c) Newton, M. D.; Ostlund, N. S.; Pople, J. A. J Chem Phys 1968, 49, 5192.
Nicholson, B. J. Adv Chem Phys 1970, 18, 249.
Pople, J. A.; Beveridge, D. L. Approximate Molecular Orbital Theory; McGraw-Hill: New York, 1970, and references therein.
(b) Harris, F. W.; Trautwein, A.; Delhalle, J. Chem Phys Lett 1980, 72, 315.
Wolfsberg, M.; Helmholz, L. J Chem Phys 1952, 20, 837.
Ruttink, P. J. A. Theor Chim Acta (Berl) 1966, 6, 83.
(b) Billingsley, F. P., II; Bloor, J. E. J Chem Phys 1971, 55, 5178.
(d) Newton, M. D. J Chem Phys 1969, 51, 3917.
Mulliken, R. S. J Chim Phys 1949, 46, 500, 521.
Parr, R. G. J Chem Phys 1952, 20, 1499.
Zerner, M. C. In Reviews in Computational Chemistry; Lipkowitz, K. B.; Boyd, D. B., Eds.; VCH: New York, 1991; Vol. 2, p 313, and references therein.
Pople, J. A.; Santry, D. P.; Segal, G. A. J Chem Phys 1965, 43, S 129.
Roothaan, C. C. J. Rev Mod Phys 1951, 23, 69.
Bouferguene, A.; Fares, M.; Hoggan, P. E. Int J Quantum Chem 1996, 57, 801.
Blyholder, G.; Coulson, C. A. Theor Chim Acta (Berl) 1968, 10, 316.
(f) Harris, F. E.; Rein, R. Theor Chim Acta (Berl) 1966, 6, 73.
Szabo, A.; Ostlund, N. S. Modern Quantum Chemistry; Macmillan: New York, 1982.
Hoffmann, R. J Chem Phys 1963, 39, 1368.
Press, W. H.; Flannery, B. P.; Teukolsky, S. A.; Vetterling, W. T. Numerical Recipes; Cambridge University Press: Cambridge, 1986.
Ayed, O.; Bernard, E.; Silvi, B. J Mol Struct (Theochem) 1986, 135, 159.
(g) Brown, R. D.; Burden, F. R.; Williams, G. R. Theor Chim Acta (Berl) 1970, 18, 98.
Pople, J. A.; Nesbet, R. K. J Chem Phys 1954, 22, 571.
(a) Newton, M. D.; Boer, F. P.; Lipscomb, W. N. J Am Chem Soc 1966, 88, 2353, 2361, 2367.
Koch, W. Int J Quantum Chem 1999, 00, 000.
1952; 20
1949; 46
1965; 43
1986; 135
1954; 22
1951; 19
1966; 6
1969 1971 1968 1969 1969 1966 1970; 4 55 49 51 51 6 18
1966 1980; 88 72
1970 1991; 2
1951; 23
1986
1999; 00
1982
1996; 57
1970; 18
1968; 10
1963; 39
1978
References_xml – reference: Roothaan, C. C. J. Rev Mod Phys 1951, 23, 69.
– reference: (a) Newton, M. D.; Boer, F. P.; Lipscomb, W. N. J Am Chem Soc 1966, 88, 2353, 2361, 2367.
– reference: Mulliken, R. S. J Chim Phys 1949, 46, 500, 521.
– reference: (a) Billingsley, F. P., II; Bloor, J. E. Chem Phys Lett 1969, 4, 48.
– reference: Ruttink, P. J. A. Theor Chim Acta (Berl) 1966, 6, 83.
– reference: Pople, J. A.; Nesbet, R. K. J Chem Phys 1954, 22, 571.
– reference: Zerner, M. C. In Reviews in Computational Chemistry; Lipkowitz, K. B.; Boyd, D. B., Eds.; VCH: New York, 1991; Vol. 2, p 313, and references therein.
– reference: Parr, R. G. J Chem Phys 1952, 20, 1499.
– reference: (d) Newton, M. D. J Chem Phys 1969, 51, 3917.
– reference: Ayed, O.; Bernard, E.; Silvi, B. J Mol Struct (Theochem) 1986, 135, 159.
– reference: Nicholson, B. J. Adv Chem Phys 1970, 18, 249.
– reference: Rüdenberg, K. J Chem Phys 1951, 19, 1433.
– reference: Pople, J. A.; Santry, D. P.; Segal, G. A. J Chem Phys 1965, 43, S 129.
– reference: Press, W. H.; Flannery, B. P.; Teukolsky, S. A.; Vetterling, W. T. Numerical Recipes; Cambridge University Press: Cambridge, 1986.
– reference: Wolfsberg, M.; Helmholz, L. J Chem Phys 1952, 20, 837.
– reference: Blyholder, G.; Coulson, C. A. Theor Chim Acta (Berl) 1968, 10, 316.
– reference: (c) Newton, M. D.; Ostlund, N. S.; Pople, J. A. J Chem Phys 1968, 49, 5192.
– reference: Cook, D. B. Structures and Approximations for Electrons in Molecules; Ellis Horwood, Chichester, 1978.
– reference: (e) Newton, M. D.; Lathan, W. A.; Hehre, W. J.; Pople, J. A. J Chem Phys 1969, 51, 3927.
– reference: (g) Brown, R. D.; Burden, F. R.; Williams, G. R. Theor Chim Acta (Berl) 1970, 18, 98.
– reference: Hoffmann, R. J Chem Phys 1963, 39, 1368.
– reference: (b) Billingsley, F. P., II; Bloor, J. E. J Chem Phys 1971, 55, 5178.
– reference: Pople, J. A.; Beveridge, D. L. Approximate Molecular Orbital Theory; McGraw-Hill: New York, 1970, and references therein.
– reference: (b) Harris, F. W.; Trautwein, A.; Delhalle, J. Chem Phys Lett 1980, 72, 315.
– reference: Bouferguene, A.; Fares, M.; Hoggan, P. E. Int J Quantum Chem 1996, 57, 801.
– reference: (f) Harris, F. E.; Rein, R. Theor Chim Acta (Berl) 1966, 6, 73.
– reference: Szabo, A.; Ostlund, N. S. Modern Quantum Chemistry; Macmillan: New York, 1982.
– reference: Koch, W. Int J Quantum Chem 1999, 00, 000.
– volume: 10
  start-page: 316
  year: 1968
  publication-title: Theor Chim Acta (Berl)
– volume: 2
  start-page: 313
  year: 1970 1991
– year: 1986
– volume: 135
  start-page: 159
  year: 1986
  publication-title: J Mol Struct (Theochem)
– volume: 20
  start-page: 837
  year: 1952
  publication-title: J Chem Phys
– year: 1982
– volume: 88 72
  start-page: 2353 315
  year: 1966 1980
  publication-title: J Am Chem Soc Chem Phys Lett
– volume: 22
  start-page: 571
  year: 1954
  publication-title: J Chem Phys
– volume: 57
  start-page: 801
  year: 1996
  publication-title: Int J Quantum Chem
– volume: 4 55 49 51 51 6 18
  start-page: 48 5178 5192 3917 3927 73 98
  year: 1969 1971 1968 1969 1969 1966 1970
  publication-title: Chem Phys Lett J Chem Phys J Chem Phys J Chem Phys J Chem Phys Theor Chim Acta (Berl) Theor Chim Acta (Berl)
– volume: 43
  start-page: S 129
  year: 1965
  publication-title: J Chem Phys
– volume: 23
  start-page: 69
  year: 1951
  publication-title: Rev Mod Phys
– volume: 00
  start-page: 000
  year: 1999
  publication-title: Int J Quantum Chem
– volume: 18
  start-page: 249
  year: 1970
  publication-title: Adv Chem Phys
– volume: 19
  start-page: 1433
  year: 1951
  publication-title: J Chem Phys
– volume: 39
  start-page: 1368
  year: 1963
  publication-title: J Chem Phys
– year: 1978
– volume: 20
  start-page: 1499
  year: 1952
  publication-title: J Chem Phys
– volume: 6
  start-page: 83
  year: 1966
  publication-title: Theor Chim Acta (Berl
– volume: 46
  start-page: 500
  year: 1949
  publication-title: J Chim Phys
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Snippet Rüdenberg's well‐known letter of 1951 contains two implications which still have not been employed so far in numerical computations: (1) Whenever all types of...
SourceID wiley
istex
SourceType Publisher
StartPage 148
SubjectTerms extended Hückel theory (EHT)
integral approximations according to Mulliken and Rüdenberg
neglect of diatomic differential overlap (NDDO)
unrestricted (and restricted) Hartree-Fock molecular orbitals
zero differential overlap (ZDO)
Title On Rüdenberg's integral approximations and their unrestricted and combined use in molecular orbital theories of Hartree-Fock type
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