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Phasing problem of heterodyne-detected two-dimensional infrared spectroscopy

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Abstract

A rigorous method is presented to measure and adjust the phase difference between the two pulse pairs used in heterodyne-detected 2D-IR spectroscopy with an accuracy better than Δφ=0.1rad. The method, which can easily be automated, avoids the otherwise tedious measurement of the much weaker pump–probe spectrum as a reference, which is the commonly used approach to phase 2D-IR spectra in a postprocessing step.

© 2008 Optical Society of America

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