A typical UV absorption spectrum, that of 2, 5-dimethyl 2, 4-hexadiene, is shown in Fig 14.3A typical UV absorption spectrum, that of 2,5-dimethyl- 2,4-hexadiene, is shown in Fig. 14.3. 200 210 220 230 240 250 260 270 nm Absorbance 吸 光 度 Wavelength 波 长 (nm) Max 242 nm (CH3 ) 2C=CHCH=C(CH3 ) 2 0.1 0.2 0.3 400 nm