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һЩÎÄÏ×ÀïÕâÑùÃèÊökasha¹æÔò£º The emitting electronic level of a given multiplicity is the lowest excited level of that multiplicity. From a symmetrical consideration,the excited states are classified into Ag and Bu symmetries in the centrosymmetric one-dimensional pai-conjugated system. Since the ground state has the Ag symmetry,only Bu excited states can be optically allowed (i.e. one-photon electric-dipole allowed). ÄÄλ´óÏÀ½âÊÍһϻòÕß·îÏ×µãÕâ·½ÃæµÄ×ÊÁÏ£¬ÔõôÑùÇø·Ö¼¤·¢Ì¬ÊÇAg»¹ÊÇBu£¿ÎÄÏ×Àï˵Èç¹ûAg¼¤·¢Ì¬µÄÄÜÁ¿¸ßÓÚBuµÄ£¬ÔòÄÜ·¢¹â£¬·ñÔò²»ÄÜ·¢¹â¡£ÕâÀD·¢Ì¬Ag£¬BuµÄÄÜÁ¿Ö¸µÄÊÇʲô£¿Ð»Ð» |
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