A new selective technique for characterization of polycyclic aromatic hydrocarbons in complex samples: UV resonance Raman spectrometry of coal liquids.
Evidence is given showing that UV resonance Raman spectroscopy (UVRRS) is a powerful technique for the identification and quantitation of polycyclic aromatic hydrocarbons (PAH's) in a coal liquid. Results suggest that this technique will be of general utility for the study of systems containing chromaphoric species absorbing in the UV spectral region. In this paper it is demonstrated that (1) the resonance Raman spectra of PAH derivatives can be selectively observed in solutions of coal liquids and (2) different UV excitation wavelengths result in the selective Raman enhancement of different polycyclic aromatic hydrocarbon ring systems.
Analytical applications of ultraviolet resonance Raman spectroscopy
Abstract UV resonance Raman spectroscopy (UVRR) is a new analytical technique with a unique selectivity which is capable of speciating individual analytes in complex samples. The new instrumentation is discussed as are applications of this technique to studies of polycyclic aromatic hydrocarbons (PAHs) in coal liquids and in tissue. UVRR can also be used to speciate PAHs eluting from high-performance liquid chromatography columns. Other applications to studies of protein structure are also described.
Raman Spectroscopy: Theory and Practice
1 Vibrational Rules of Selection and Polarization: Their Practical Uses and Limitations.- Vibrational Selection Rules.- Polarization Rule for Raman Scattering.- Predictions from the Rules.- Rough Estimates of Fundamental Frequencies.- Simple Examples of Structure Determination.- Complications and Limitations.- Further Examples.- Concluding Comments.- References.- 2 Developments in the Theories of Vibrational Raman Intensities.- Vibronic Expansion Approach.- Ground-State Approach.- Appendix A.- Appendix B.- Appendix C.- References.- 3 Raman Spectroscopy with Laser Excitation.- Experimental Techniques.- Methods and Results for Amorphous Media.- Methods and Results for Crystals.- Conclusion.- References.- 4 Low-Frequency Raman Spectra of Liquids.- Experimental Methods.- Results.- Future.- References.- 5 High- and Low-Temperature Raman Spectroscopy.- High-Temperature Techniques.- Low-Temperature Techniques.- Molten Salts and Other High-Temperature Systems.- Results from Low-Temperature Studies.- Assessment of Results.- References.- 6 Raman Spectroscopy with Poor Scatterers.- Definition of Poorly Scattering Sample.- Instrumentation Considerations.- Sample Improvement.- References.- Appendix Comments on the Derivation of the Dispersion Equation for Molecules.- The Zeroth-Order Problem.- Quantum Description of the Radiation Field.- The Interaction Term.- The Dispersion Equation.- The Molecular Polarizability.- Remarks.- References.