1. Vibrational spectra. Vibrational level. Harmonic oscillator
Reminder
In an absorption band, radiation undergoes a decrease in intensity. Lambert's law relates absorbance (optical density) to the thickness d of the absorbing medium: lg I/I 0 = ad
and, in solution, a is proportional to the concentration c :
lg I/I 0 = ε λ cd
with c in mol/L, d in cm.
The molar extinction coefficient ε λ thus defined is characteristic of the sample at each wavelength. It is homogeneous to one surface area per mole, i.e. to the photon capture cross-section of the molecule.
The problem...
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Vibrational spectra. Vibrational level. Harmonic oscillator
Applying the model to polyatomic molecules
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Bibliography
References
- (1) - GILLI (G.) et coll - J. Amer. chem. Soc. 116, p. 909 (1994).
- (2) - KAYE (W.) - Spectrochimica Acta p. 257 (1954) ; p. 181 (1955).
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