Ionization-Raman Double-Resonance Spectroscopy

Ionization-detected stimulated Raman spectroscopy (IDSRS)[1] is a new technique for high-sensitivity, high-resolution Raman studies based on resonant laser ionization/detection of vibrationally excited molecules. We present results on the application of IDSRS to the Raman spectroscopy of benzene. Our spectra concentrate on the region near 1600 cm-1 where the overlap of transitions to the (v 16, v 2+v 18) Fermi dyad produces a particularly complex spectrum. By taking advantage of the double-resonance capabilities of IDSRS, we are able to cleanly separate transitions to each of the two vibrational bands, and thereby greatly simplify their spectra.