Merging of the TPS and FTIR data for N₂ ice after the 54-minute-long deposition. (a) Amplitude of the complex transmission coefficient |$\tilde{T}(\nu )$| retrieved from the TPS (green markers) and FTIR (blue) data, and the resultant merged curve (red); see Eqs. (1) and (2) for the definitions of the transmission coefficients. (b) Zoom-in on the overlapping TPS and FTIR data. (c) Phase of the complex transmission coefficient, ϕ(ν). The TPS phase, ϕ_TPS (green markers), FTIR-based Kramers-Kronig phase, ϕ_K–K (blue line), and resultant broadband phase (red) are shown. (d) Low-frequency behavior of the FTIR-based Kramers-Kronig phase, ϕ_K–K.