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Referring to Figure 18-19 , the absorbance profile shows several peaks, which correspond to electronic transition

to the:

A. the pi and pi* orbitals

B. molecular orbital theory

C. the HOMO and the LUMO

D. lowest unoccupied electronic level, and then the next higher electronic level, etc.

E. vibrational and rotational coupling with the electronic levels.

F. lowest unoccupied electronic energy level, but different vibrational levels.6064024D-62E8-4851-80CE-25A8148BA33A.png

6064024D-62E8-4851-80CE-25A8148BA33A.png

An for
An for
FIGURE 18-19 Absorption (black line) and
absorption
emission
emission (colored line) of bis(benzylimido)
perylene in dichloromethane solution,
illustrating the approximate mirror image
Absorption
Fluorescence
relation between absorption and emission. The
10 M
10 1 M
10-" M solution used for emission had an
Absorbance -
average of just 10 analyte molecules in the
volume probed by the 514-nm excitation laser.
[Data from P. J. G. Goulet, N. P. W. Pieczonka, and
R. F. Aroca, "Overtones and Combinations in Single-
C
Emission
Molecule Surface-Enhanced Resonance Raman
Scattering Spectra," Anal. Chem. 2003, 75, 1918.]
300
400
500
600
700
800
Wavelength (nm)

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