Time resolved IR abs​orption spectroscopy

03 Feb 2010

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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.

Ultra has three TRIR platforms with TR^MPS (Time resolved multiple probe spectroscopy) capability that enables dynamic measurements covering 10 orders of magnitude in time from 100 fs to ms.  

1. 50 fs, 10 kHz pump-probe.  2x128 element MCT array spectrometers to capture spectra over 500 cm-1 in one laser shot.
2. 200 fs, 100 kHz pump-probe, three OPAs for two probe spectral regions and an independently tunable pump.  2x128 element MCT array spectrometers.  With TR^MPS capability
3. 50 fs, 10 kHz pump-probe (UV/Vis or IR pump, 2D-IR probe).  2x128 element MCT array spectrometers.  With TR^MPS capability

 

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.

Selected recent publications

• Kendrick et al. 2020. 10.1039/C9SC05717J
• Bartlett et al. 2019. 10.1021/jacs.8b13848