Schematics of the concepts for (a) ionization-loss stimulated Raman spectroscopy, where resonant two-photon ionization of the molecular parent, follows the depletion of ground state reactant species as a result of stimulated Raman excitation and (b) vibrationally mediated photodissociation, where pre-excited molecules are dissociated and the ensuing H photofragments are probed by resonantly enhanced multiphoton ionization.
Methylamine vibrational spectra: (a) H action spectrum obtained via 243.135 nm dissociation of vibrationally excited molecules and (b) ionization-loss stimulated Raman spectrum exhibiting the depletion of parent molecule ionization signal due to vibrational pre-excitation.
The excited vibrational modes of methylamine, fraction of excited molecules, enhancement factors, partial cross sections for the 243.135 nm H dissociation out of different initially prepared vibrational states and for excitation of vibrationless ground state molecules at the corresponding combined energies.
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