Figure 3.

Femtosecond fluorescence up-conversion of DNA assemblies with 5Z and 5G, detected at 600 nm (Upper) and 670 nm (Lower) in the short (Left) and the long (Right) time range. At the short wavelength, there is a solvent-alone spike around t = 0 (see a), which is absent at the longer wavelength (670 nm). The sample conditions are given in Fig. 2.