Fig. 2

Dual oscillators. SFG intensity spectra of two oscillators on a surface simulated for ω ₁ = 2880 cm⁻¹, γ₁ = 0°, ω ₂ = 2950 cm⁻¹, γ₂ = 180°, A _v M _v  = 10, Γ _v  = 20 cm⁻¹, χ ⁽³⁾ = 1, and Φ(0) = −240 mV (purple), −170 mV (blue), < 1 mV (green), + 170 mV (orange), and + 240 mV (red), with an ionic strength of 1 mM, calculated without a and with b absorptive-dispersive interactions