Abstract

Localized sample heating by the exciting radiation is a constant problem in Raman spectroscopy of absorbing solutions. Static temperature control devices such as the Miller-Harney cell are ineffective when the sample has significant absorbance at the wavelength of excitation. Previous workers have circumvented this difficulty by employing either rotating or stirred sample cells. These methods allow the use of high exciting energy while maintaining sample temperature near ambient. However, these methods do not allow <i>control</i> of the sample temperature, without resorting to rather complicated accessories and scattering geometries. Furthermore, we find that the rotating cell technique sometimes leads to baseline instability in resonance Raman spectra of samples having appreciable background fluorescence.

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