ULTRA: A Unique Instrument for Time-Resolved Spectroscopy

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Abstract:

We report the development of a high-sensitivity time-resolved infrared and Raman spectrometer with exceptional experimental flexibility based on a 10-kHz synchronized dual-arm femtosecond and picosecond laser system. Ultrafast high-average-power titanium sapphire lasers and optical parametric amplifiers provide wavelength tuning from the ultraviolet (UV) to the mid-infrared region. Customized silicon, indium gallium arsenide, and mercury cadmium telluride linear array detectors are provided to monitor the probe laser intensity in the UV to mid-infrared wavelength range capable of measuring changes in sample absorbance of ΔOD ∼ 10–5 in 1 second. The system performance is demonstrated for the time-resolved infrared, two-dimensional (2D) infrared, and femtosecond stimulated Raman spectroscopy techniques with organometallic intermediates, organic excited states, and the dynamics of the tertiary structure of DNA.

Keywords: 2DIR; FEMTOSECOND STIMULATED RAMAN SPECTROSCOPY; INSTRUMENTATION; RAMAN SPECTROSCOPY; SPECTROMETER; TIME-RESOLVED SPECTROSCOPY; TWO-DIMENSIONAL INFRARED SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370210793561673

Affiliations: 1: Central Laser Facility, Research Complex at Harwell, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0QX, UK. Greg.Greetham@stfc.ac.uk 2: Central Laser Facility, Research Complex at Harwell, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0QX, UK 3: School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK 4: Technology Department, STFC, Daresbury Laboratory, DSIC, Warrington, Cheshire, WA4 4AD, UK 5: School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK. Mike.George@nottingham.ac.uk 6: Central Laser Facility, Research Complex at Harwell, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0QX, UK. Tony.Parker@stfc.ac.uk 7: Central Laser Facility, Research Complex at Harwell, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0QX, UK. Mike.Towrie@stfc.ac.uk

Publication date: December 1, 2010

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