Until now, ultrafast IR spectroscopy has been limited by the bandwidth of optical parametric amplifiers, typically . Here we present the first example of transient IR spectroscopy using a continuum laser source to probe the entire mid-IR region with ultrafast time resolution. The continuum source is based on focusing the fundamental, second harmonic, and third harmonic of 1 mJ, 25 fs, 800 nm pulses in air, generating continuum mid-IR pulses that span the frequency range of to or, conversely, to . We characterize the spectral and temporal properties of dicarbonylacetonato rhodium(I) in hexane. We further demonstrate the versatility of the method by measuring the very fast and broad () spectral changes following IR excitation associated with the 7-azaindole–acetic acid heterodimer in carbon tetrachloride.
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