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An isolated n-atom molecule has 3n degrees of freedom and 3n−6 vibration degrees of freedom. The collective motions of atoms, moving with the same frequency and which in phase with all other atoms, give rise to normal modes of vibration. In principle, the determination of the form of normal modes for any molecule requires the solution of equation of motion appropriate to the n-symmetry. ÎҵķÒ룺һ¸ö¾ßÓÐn¸öÔ×ӵĹÂÁ¢·Ö×Ó¾ßÓÐ3n¸ö×ÔÓɶȣ¬3n-6¸öÕñ¶¯×ÔÓɶȡ£Ô×ÓÒÔÏàͬµÄƵÂʼ¯ÌåÔ˶¯£¬ÕâÖÖÔ˶¯ÓëËùÓÐÆäËüÔ×ÓͬÏ࣬²úÉúÁ˼òÕýÕñ¶¯Ä£¡£ÔÔòÉÏ£¬ÈκηÖ×Ó¼òÕýÄ£ÐÎʽµÄÈ·¶¨¶¼ÐèÒª¶ÔÊÊÓÃÓÚn´Î¶Ô³ÆÔ˶¯·½³ÌµÄ½âÎö¡£ Ö÷ÒªÒÉÎÊ£º£¨1£©collective motionsÊǼ¯ÌåÔ˶¯µÄÒâ˼Â𣿠£¨2£©movingµÄÖ÷ÓïÊÇʲô£¿motions£¿Ô˶¯Òƶ¯£¿ £¨3£©in phase with:Ó롡ͬÏࣿÔ˶¯Ò²ÄÜ¡°Í¬Ïࡱ£¿ £¨4£©Èç¹û°´ÎÒÀí½âËùÒ룬ËùÓÐÔ×Ó¶¼¡°¼¯Ì塱Ô˶¯ÁË£¬ÓÖºÎÀ´£¬¡°other atoms¡±Ö®Ëµ£¿ £¨5£©¡° equation of motion appropriate to the n-symmetry¡±ÒëΪ¡°ÊÊÓÃÓÚn´Î¶Ô³ÆÔ˶¯·½³Ì¡±ÊÇ·ñºÏÀí? Çó¸ßÊÖÖ¸µã¡£ |
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