B带:由苯的π→π* 跃迁和振动效应的重叠引起，为一宽峰并出现若干小峰，在230~270nm之间，中心在254 nm处，εmax≈250左右。是苯环的特征峰。 苯环被取代后，精细结构消失或部分消失。B带常用来识别芳香族化合物 — E带:又分为E1和E2带 E1带: λmax= 184 nm左右，lgε> 4。为苯环的特征谱带，吸收强度较大。当苯环上有助色团时，向长波方向移至200~220 nnmn。 E2带:λmax≈203 nm左右， εmax=7400。是苯环中共轭二烯引起的π→π*跃迁。该带相当K带。当苯环引入发色团与苯环共轭时，E2带移至220~250 nm, ε>l0000,此时亦称为K带。
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