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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) ÓйØ×ÔÐýÎÛȾµÄһЩÌÖÂÛ ÓйØ×ÔÐýÎÛȾµÄһЩÌÖÂÛ ×ÔÐýÎÛȾÊÇÔÚ·ÇÏÞÖÆ´ÓÍ·¼ÆËãÖеÄÎó²î£¬Í¨³£ÔÚ×ÜÄÜÁ¿ÖÐÇá΢³öÏÖ¡£ÕâÊÇÓÉÓÚ»ù̬²¨º¯ºÍ¸ü¸ßÄÜ̬·¢Éú»ìºÏ¡£¸ßµÄ×ÔÐýÎÛȾ»áÓ°Ïì½á¹¹ºÍ²¼¾ÓÊý·ÖÎö£¬²¢¼«´óµØÓ°Ïì×ÔÐýÃܶȡ£Ëü»¹»áÓ°ÏìÊÕÁ²£¬ÌرðÊÇMPnÈÎÎñ¡£ ¿ÉÒÔͨ¹ý±È½Ï×Ü×ÔÐýSµÄÔ¤ÆÚÖµºÍ¼ÆËãÖµÑéÖ¤×ÔÐýÎÛȾ¡£SÓ¦µ±µÈÓÚs(s+1)¡£¶ÔÓÚÓлú·Ö×Ó£¬Æ«²î²»³¬¹ýÕýÈ·Öµ10%µÄ¼ÆËãͨ³£ÊǿɽÓÊܵġ£ ÓеÄÍøÓѶÁµ½ÕâÀï¿ÉÄÜÐÄÀïÓÐÒÉÎÊ£¬Èç¹û²¨º¯ÊýÊDz»Í¬×ÔÐý±¾Õ÷ÖµµÄ²¨º¯ÊýµÄÏßÐÔ×éºÏ£¬ ÄÇôÔõÑù½«²¨º¯Êý·ÖΪalphaºÍbetaÁ½ÀàÄØ£¿ ûÓа취,Èç¹û²¨º¯ÊýÊDz»Í¬×ÔÐý±¾Õ÷ÖµµÄ²¨º¯ÊýµÄÏßÐÔ×éºÏ,ËäÈ»Âú×ãÁËÊÇS*2±¾Õ÷ ̬µÄÒªÇó,µ«Êǵ¥µç×ÓµÄͼÏñ»á±äµÃÄ£ºý²»Çå,µ¥µç×Ó¹ìµÀÒ²¾Í²»Ã÷È·ÁË,Õâ¾ÍÊÇROHFµÈ·½·¨ µÄȱÏÝËùÔÚ. ÎÄÏ×ÖÐÓÐÕâôһ¾ä»°,"Actually, the HF orbitals are in a sense much farther away from the real system since they neither reflect correlation effects nor do they yeild the exact density. 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