@紫外秈可见哑收光谱 n→>兀*跃迁:不在同一平面,比较困难 吸收小,≤100 532紫外光谱图 CH3 CH CH3-C=CH—cH=C—CH3 Absorbance 200210220230 260 270 310 Wavelength (nm) FIGURE 13.3 The V absorption spectrum of 2.5-dimethyl-2, 4-hexadiene in methanol at a concentration of 5. x 10-5 M in a 1. 00-cm cell(Spectrum courtesy of Sadtler Research Laboratories, Inc., Philadelphia.)n→* 跃迁：不在同一平面，比较困难 吸收小，100 §3.2 紫外光谱图