A simple, inexpensive technique for optogalvanic frequency calibration of tunable dye lasers is presented. Its feasibility is demonstrated in the acquisition of the photoluminescence excitation (PLE) spectrum of a weakly emitting species. This experiment reveals a number of problems inherent in the use of tunable dye lasers in low-light-intensity investigations, for example, in obtaining PLE spectra or in obtaining resonance Raman enhancement profiles.

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