波长/pm 2.5 0.0 0.20 多0.30 CH3CH2(CH2)BCH2CH3 0.40 1380 0.50 0.60 1450 29802830 2. 4000350030002500200018001600140012001000800600 波数/ 十二烷的红外光谱 A:C-H伸缩振动(2962cm1,2926cm-1,2872cm1,2853cm1) B:C-H弯曲振动(1465cm1,1450cm-1,1375cm1)