Figure 8.

Decay associated spectra (DAS) for time constant τ₁ = 5.5 ps (open circles and open squares) and time constant τ₂ = 540 ps (solid circles and solid squares) for polarizations parallel and perpendicular to pump pulse polarization. (a) Derivative of water vapor spectrum inducing small distortions on spectral shape. We used the distortions to test our spectral alignment. (b) Excitation at 713 nm. (c) Excitation at 644 nm. (d) Excitation at 400 nm.