Using a broadband mIR laser pulse, species are vibrationally excited inducing an oscillating net polarisation at the interface which is probed by narrowband laser pulse. Owing to its surface specificity, VSFG is ideally suited to study buried interfaces. Owing to the high repetition rate of the lasers employed, spectra can be obtained in seconds allowing changing compositions of the interfacial region during chemical reactions to be probed, facilitating the understanding of interfacial chemistries. Read a selection of publications arising from these experiments now.
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Schematic of the broadband VSFG technique employed in the ECLL. Adapted from Phys. Chem. Chem. Phys., 2019, 21, 12067.
Capabilities include:
- 10 kHz repetition rate.
- Tuneable mIR radiation between 2500 – 16000 nm (4000 – 625 cm-1).
- 13 cm-1 linewidth of upconversion pulse.
- Time asymmetric upconversion pulse allowing suppression of the non-resonant response.
- Polarisation control of both mIR and upconversion beams.
- Large flexible sample area.
- Manual sample stage allowing accurate sample positioning.
- Signal detected in both transmission and reflection geometries.
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