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  sectionÖ±½ÓʹÓÃUMP2£¨¶Ô¿ª¿Ç²ãÌåϵ£©¹Ø¼ü´Ê£¬È»ºóÔÚ½á¹ûÖÐÑ¡ÓÃprojectedºóµÄÄÜÁ¿¼´¿É£©£¬¶øÇÒËٶȱȻùÓÚmulti-
  referenceµÄ·½·¨¸ü¿ì£¨CASSCF³ýÍ⣩¡£ab initioµÄ¼ÆËãÖ÷Òª»ùÓÚerror cancelling ±ÈÈç·´Ó¦ÈÈ£¬·´Ó¦ÊÆÀݵȣ¬Ã»ÓÐÈ˶Ծø
  ¶ÔÄÜÁ¿¸ÐÐËȤ¡£anyway£¬ËäÈ»UHFÓÐspin contaminationµÄÎÊÌ⣬µ«ÊÇʹÓÃUHF¼ÆËãµÄground stateµÄÄÜÁ¿Ò»°ã±ÈROHF¸üµÍ£¬Òò
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  ²¹³äÐÅÏ¢
  Ò»Ð©ÌÖÂۺͽá¹ûÔÚ£º
  W. J. Hehre, L. Radom, P. v.R. Schleyer, J. A. Pople "Ab Initio Molecular Orbital Theory" Wiley (1986)
  An article that compares unrestricted, restricted and projected results is
  M. W. Wong, L. Radom J. Phys. Chem. 99, 8582 (1995)

  Some specific examples and a discussion of the half electron method are given in
  T. Clark "A Handbook of Computational Chemistry" Wiley (1985)

  A more mathematical treatment can be found in the paper
  J. S. Andrews, D. Jayatilake, R. G. A. Bone, N. C. Handy, R. D. Amos Chem. Phys. Lett. 183, 423 (1991)

  SUHF results are examined in
  P. K. Nandi, T. Kar, A. B. Sannigrahi Journal of Molecular Structure (Theochem) 362, 69 (1996)

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