Time-Resolved Infrared Spectroscopy in Supercritical Fluids

Time-resolved infrared spectroscopy of RNA folding.

We introduce time-resolved infrared spectroscopy as a powerful method to study the kinetics of RNA folding and unfolding transitions. A laser-induced temperature jump is used to initiate a perturbation in the RNA structure. A probe laser, tuned to a specific infrared absorption of the RNA, is then used to monitor the subsequent relaxation kinetics. A 10-ns pump pulse permits the investigation o...

Time-resolved Spectroscopy Fast Time-resolved Mid-infrared Spectroscopy Using an Interferometer

The development of fast time-resolved mid-infrared (MIR) spectroscopy since the 1980s has provided an effective tool for the study of transient chemical species in dynamic systems.1,2 Interest in this particular spectroscopy stems from the virtual universality of infrared (IR) absorption, the rich molecular structural information contained in the MIR spectrum, and the fast time scale of vibrati...

Time-resolved nonlinear infrared spectroscopy of samarium ions in SmFeO3

Subnanosecond, time-resolved, broadband infrared spectroscopy using synchrotron radiation

A facility for subnanosecond time-resolved ~pump-probe! infrared spectroscopy has been developed at the National Synchrotron Light Source of Brookhaven National Laboratory. A mode-locked Ti:sapphire laser produces 2 ps duration, tunable near-infrared pump pulses synchronized to probe pulses from a synchrotron storage ring. The facility is unique on account of the broadband infrared from the syn...

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 ...