Linear and Non-Linear IR Spectroscopy
03 Feb 2010



Linear and Non-Linear IR Spectroscopy


​​​Transform limited infrared pulses provide 50 fs broadband output, 400 cm-1, allowing collection of a wide spectral window in a single shot.

The stable, femtosecond mid-IR probe beams are used to measure small changes (ΔA ca 10-6) in sample absorption following photo-excitation of electronic or vibrational transitions in molecules.

The Ultra TRIR station has 2 x 128 pixels (probe) and 1 x 64 element (reference) mercury cadmium telluride (MCT) array detectors from IR Associates and Infrared Development Systems that measure the single shot IR spectra over a 500 cm-1 spectral window and 850 to 5000 cm-1 range. The MCT arrays connect to high speed 512 channel 10 kHz readout DAQs.

Time-resolved infrared spectrum of phenylbenzophenone triplet state formation in CD3OD solvent.  Positive peaks are transient species formed on excitation to the triplet-state.  Negative peaks are the bleaches of the ground state infrared spectrum upon excitation.
Contact: Towrie, Mike (STFC,RAL,CLF)