Transient Absorption Spectroscopy (TA). Pump-probe spectroscopy was conducted with a femtosecond transient absorption spectrometer (HELIOS Fire) from Ultrafast Systems. An Astrella-F ultrafast Ti:sapphire amplifier from Coherent was used to generate 90 fs laser pulses at a repetition rate of 1 kHz at a central wavelength of 800 nm. A beam splitter was used to split the fundamental beam into a pump and a probe beam. The pump beam wavelength was altered to monochromatic 325 nm (0.5 µJ/pulse) by using the fourth harmonic of the signal in an Apollo-T optical parametric amplifier from Ultrafast Systems. The probe beam was directed to a mechanical delay-line from Ultrafast Systems to create time delays between the pump and probe up to 8 ns.