Picosecond Spectroscopy

Picosecond Emission Spectroscopy

A picosecond emission apparatus utilizing a mode locked Nat3 /phosphate glass laser and a streak camera -optical -multichannelanalyzer detection system is described, and some general classes of experiments in this research area are discussed. Special emphasis is placed on nonexponential decays. A new type of diffusion controlled chemical reaction based on rotational diffusion is proposed for st...

Picosecond photofragment spectroscopy . II . The overtone initiated

Tip-Enhanced Raman Spectroscopy with Picosecond Pulses.

Tip-enhanced Raman spectroscopy (TERS) can probe chemistry occurring at surfaces with both nanometer spectroscopic and submolecular spatial resolution. Combining ultrafast spectroscopy with TERS allows for picosecond and, in principle, femtosecond temporal resolution. Here we couple an optical parametric oscillator (OPO) with a scanning tunneling microscopy (STM)-TERS microscope to excite the t...

Picosecond timescale Raman processes and spectroscopy

Time resolved properties of vibrational states of molecules on the picosecond scale are surveyed using both conventional spontaneous Raman effects as well as coherent Raman processes. In certain respects the coherent signal methods have been found to have distinct advantages related to their intrinsic time gating capability but they can have dis— advantages in the form of nonresonant background...

Picosecond time-resolved infrared spectroscopy of rhodium and iridium azides.

Picosecond time-resolved infrared spectroscopy was used to elucidate early photochemical processes in the diazido complexes M(Cp*)(N3)2(PPh3), M = Rh (), Ir (), using 266 nm and 400 nm excitation in THF, CH2Cl2, MeCN and toluene solutions. The time-resolved data have been interpreted with the aid of DFT calculations on vibrational spectra of the singlet ground states and triplet excited states ...