Fig. 4

CARS and NVRB response in electronically resonant and non-resonant condition. CARS and NVRB spectral profiles for a–c electronically nonresonant and d–f resonant regimes, as derived from Eqs. (5) and (6), considering^45,47 τ_ba = τ_da = τ_ea = 10 fs, γ_ca = FWHM(G)/2 = 6 cm⁻¹. a, c Normalized \(\Re (P_{{\mathrm{CARS}}}^{(3)})\), \(\Im (P_{{\mathrm{CARS}}}^{(3)})\), and \(\Re (P_{{\mathrm{NRVB}}}^{(3)})\), \(\Im (P_{{\mathrm{NRVB}}}^{(3)})\). Colormaps in b, e generalize a, d for different η_NVRB/η_CARS, as for Eqs. (7) and (8). In c, f, selected spectra corresponding to three η_NVRB/η_CARS from the colormap are reported