By C. Bradley Moore
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27. Al'Sehitz, E. , Personov, R. , and Kharlamov, B. , Chem. Phys. Lett. 40, 166 (1976) and references cited therein. 28. Merle, A. , and Grivet, J. , Chemical Physics 22, 207 (1978). 29. Smalley, R. , and Levy, D. , Chemical and Biochemical Applications of Lasers 2, 1 (1977). Chemical and Biochemical Applications of Lasers BIOLOGICAL APPLICATIONS OF RESONANCE RAMAN SPECTROSCOPY IN THE VISIBLE AND ULTRAVIOLET: VISUAL PIGMENTS, PURPLE MEMBRANE, AND NUCLEIC ACIDS1 Richard Mathi es Department of Chemistry University of California Berkeley, California I.
Thus the spectrum summed for all molecules in the ensemble will be S(v) = / D(v0)s(v-v0)dv0 (13). Two strategies for obtaining sharp spectra have become clear. One is to make the solvent shift distribution D(v0) as narrow as possible. This is the approach taken in doped Site Selection Spectroscopy -80 -60 43 -40 -20 0 20 40 60 80 Frequency, c m FIGURE 6. Absorption line shapes for vibronic spectra in solid solution. The sharp features, called the zero-phonon lines, are 0-0 sequence bands for the phonon oscillators.
In the best Bryan E. Kohler 34 MOLECULES ENSEMBLE MOLECULES ENSEMBLE b) FIGURE 3. The limiting cases of homogeneous and inhomogeneous broadening. In the homogeneous case, a), the spectrum summed over all molecules in the sample corresponds identical^ ly to that for any one of the individual molecules. In the inhomogeneous case, b), the spectrum summed over all molecules in the sample differs from the spectrum that would be seen for any single molecule. 3 cm-1 (1). With such an improvement in the quality of the data the interpreta tion of these spectra in terms of fundamental chemical properties becomes a much more realistic endeavor.