Skip to main content
. Author manuscript; available in PMC: 2010 Aug 19.
Published in final edited form as: J Am Chem Soc. 2009 Aug 19;131(32):11535–11547. doi: 10.1021/ja902224m

Figure 3.

Figure 3

Transient absorption (ΔA) spectra of azide 5 (1.2 mM) in i-PrOH for various delay times (in picoseconds, shown in the legends) between the probe and pump pulses. A and B: The solution was flowed through a 0.5 mm flow cell and excited with a 420-nm, 3.5 μJ pulse. C, D, and E: The solution was flowed through a 0.2 mm flow cell and excited with a 305-nm, 3.8 μJ pulse. The solvent contribution to the ΔA spectra is minor at delay times ≥ 100 fs, see Fig. SM1 in Supporting Information. For 305 nm excitation, the UV region (280-375 nm) of the ΔA spectra was measured using the probe light generated by TOPAS ([azide 5] = 1.7 mM, 3.1 μJ pump pulse) and subsequently scaled to the visible (360-665 nm) ΔA spectra measured using the white-light continuum probe. The inset compares the ΔA kinetic traces recorded at probe wavelengths of 350 and 465 nm.