①o→6*E>800Kj/mol, n产G* 入。-o~l50nm(in alkane)) 元* E n产元米 ②n→0*入m-。*~200nm, 8~102,weak.(C-X,C-O, n ↓ C-N) 元产元* ③T→T*non-conjugate 元 <200 nm,conjugate 0之G* 入，->200nm,e>104, strong(K带) ④n→π*，x*~300nm.n→元*band is called R band(R带)， weak,e max 10-100. -90,-9-9-g-    2

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