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ULTRA: A Unique Instrument for Time-Resolved Spectroscopy

Volume 64, Number 12 (Dec. 2010) Page 1311-1319

GREGORY M. GREETHAM,* PIERRE BURGOS, QIAN CAO, IAN P. CLARK, PETER S. CODD, RICHARD C. FARROW, MICHAEL W. GEORGE,* MOSCHOS KOGIMTZIS, PAVEL MATOUSEK, ANTHONY W. PARKER,* MARK R. POLLARD, DAVID A. ROBINSON, ZHI-JUN XIN, and MICHAEL TOWRIE*


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.

Index Headings: Two-dimensional infrared spectroscopy; 2DIR; Raman spectroscopy; Time-resolved spectroscopy; Femtosecond stimulated Raman spectroscopy; Spectrometer; Instrumentation.