SEARCH Articles Figures Tables 1 REMPI and UV absorption spectra of 1,3-DMU . The 1 1 REMPI spectrum was obtained by scanning the pump laser and setting the probe laser at 220 nm with a delay time of 10 ns. Neither REMPI spectrum was normalized by the laser power, and at the short wavelength side of the figure, the low output power of the OPO laser resulted in the missing S3 feature in the 1 1 spectrum. The absorption spectrum was taken at 140 C, the same temperature as that of the pulsed valve during the REMPI experiments. [Publishers Imprint]