Femtosecond time resolved IR spectrometer

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Our group has ample experience in the investigations of ground-, reduced-, oxidized- and / or excited-state properties with time-resolved spectroscopy. Among others, fs transient absorption pump-probe experiments with tuneable excitation wavelengths and detection ranges that span from 400 to 1600 nm are at the forefront of our investigations. However, insight into detailed structural aspects of the investigated compounds can only be obtained to a limited extend from electronic absorption and emission spectra. Therefore, we apply for funding to equip our femtosecond laser system with a fs time resolved IR spectrometer. This broadband mid-infrared (2-13 μm) pump-probe femtosecond Transient Absorption Spectrometer enables the acquisition of IR spectral and kinetic data upon photoexcitation. Time resolved vibrational spectroscopy with high spectral (about 5 wavenumbers) and temporal (about 150 fs) resolution will be extremely helpful in studying the generation and fate of electronically excited states, charge transfer states, charge separated states etc. in more detail. Especially when inorganic metal complexes or molecules with IR active functional groups are investigated, where the vibrational spectra change significantly with the structure and with the electronic configuration of the metal ion, a fs time resolved IR spectrometer constitutes a meaningful and very helpful complement to our already existing time resolved spectroscopic techniques.