Multiresonant nonlinear spectroscopy has been used to achieve narrowing of inhomogeneously broadened spectral transitions. Multiply enhanced nonparametric spectroscopy (MENS) has been used to observe the narrowing in pentacene doped benzoic acid. The signal dependence of pentacene and benzoic acid lines on sample absorbance, detuning and laser intensity are studied. Recent paper from our group have established that nonlinear spectroscopy offers unique capabilities for dissecting individual spectral features of components in mixtures, narrowing inhomogeneously broadened spectral bands, and measuring mode mixing between vibrational states $LB@1 - 22$RB@. This paper will present additional information that complements previously published work.
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