Figure 4

Temporal change of THz power spectra during volatilization of CH3CN droplets and diffusion of CH3CN gas in the gas cell A filled with smoke (see Video 1).
(a) 1 s, (b) 5 s, (c) 10 s, (d) 15 s, (e) 20 s, (f) 30 s, (g) 40 s and (h) 50 s after volatilization of the CH3CN droplets.