文档介绍：Chapter 9 Ultraviolet Spectrophotometry, UV (紫外吸收光谱分析) Electronic transitions include three kinds of types: ● N→V transitions include →* transitions in saturated pounds andπ→π* transitions in unsaturated compounds. ● N→Q transitions: a kind of transitions arise from the electron excitation from nonbonding orbital to anti-bonding orbital. ● N→R transition: electron is excited to a higher level until it is ionized to molecular ion. ● Charge transfer transitions: charge (electron) transfers between different parts of pound due to charge redistribution of pound excited by a radiation. * : anti-bond orbital (稀) (炔) (羰基) →* > n→* ≥π→π* > n →π*/ ligand field transition Energy order of various electronic transitions: Vacuum ultraviole radian Near ultraviole radiation Visible light →* π→π* n→* n→π* n→π* Charge transfer λ/nm Wavelength region and intensity mon electronic transitions