Picosecond spectroscopy laser saturation

Picosecond absorption spectroscopy has been employed to follow the time-dependence of the optical absorption during the formation of e, while pulsed-laser saturation spectroscopy has been used to examine the... 

Our present experimental arrangement for kinetic laser saturation spectroscopy with a g-switched ruby laser has been described in detail previously where it has been shown that the amplitude and temporal profile of the probe laser pulses contain the picosecond time history of the /i-level... 

In one of the first important applications of transient RR spectroscopy to coordination compounds, Ballinger, Woodruff, and co-workers, used 10 ns, 355 nm pulses from a Nd YAG laser to study the MLCT state of Ru(bpy)3 +, which has a lifetime (at room temperature in aqueous solution) of 600ns. The ground state of the complex exhibits relatively weak absorption near 350 mn. However, the high photon fluxes available are sufficient to saturate the irradiated volume in excited state within a few picoseconds, so that scattering occurs from the MLCT excited state. Fortuitously, in this case and many others, the MLCT state possesses a ligand centered tt-tt absorption band near 350 nm, so that the 355 nm laser wavelength is in resonance with the MLCT excited-state species. 

---