We investigated the IRS1 response under various resonance conditions, demonstrating that the resulting lineshapes - positive, negative, or dispersive- depend on the Raman pump wavelength relative to the sample absorption and the probed vibrational mode.
An expression for the IRS Raman gain was first derived for arbitrary spectral profiles of the Raman pump and probe pulses. The response was then analytically evaluated in the case of a monochromatic pump and an impulsive probe.
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