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Originally posted by yytsnake at 2009-10-8 17:30:
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By using a lower symmetry than the molecule has there might be several equal
symmetry planes possible to use as main symmetry plane.
IOP(2/20) is needed to define which one is the main symmetry plane.

IOp(2/19)
Largest allowed point group, as Hollerith string.

IOp(2/20)
Number (1-3 for X-Z) of axis to help specify which subgroup of the type specified in IOp(19) to use.

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loovfnd(½ð±Ò+2,VIP+0):¸Ðл²ÎÓ룡 10-8 18:21
yjcmwgk(½ð±Ò+2,VIP+0):ÓÐÓÃÓÐÓã¡Äã˵µÄÌ«ºÃÁË¡£ÎÒ¾­³£×÷Ϊ°ßÖñµÄÉí·ÝÈ¥½Ìѵ±ðÈË¡°È¥¿´¸ß˹˵Ã÷ÊéÖйØÓÚ¡­¡­µÄ²¿·Ö¡±£¬Õâ´ÎÄãÒ²¸ÃºÝºÝ½ÌѵÎÒ¡°È¥¿´GaussianIOPÖйØÓÚ¡­¡­µÄ²¿·Ö¡± 10-9 10:55
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By using a lower symmetry than the molecule has there might be several equal
symmetry planes possible to use as main symmetry plane.
IOP(2/20) is needed to define which one is the main symmetry plane.

IOp(2/19)
Largest allowed point group, as Hollerith string.

IOp(2/20)
Number (1-3 for X-Z) of axis to help specify which subgroup of the type specified in IOp(19) to use.

[ Last edited by yytsnake on 2009-10-8 at 17:45 ]
3Â¥2009-10-08 17:30:45
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