Frequency-frequency correlation functions and apodization in two-dimensional infrared vibrational echo spectroscopy: A new approach by Kyungwon Kwak and others 2026-11-05
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Primary author-hosted full text. Exact byline: Kyungwon Kwak, Sungnam Park, Ilya J. Finkelstein and M. D. Fayer. Journal of Chemical Physics 127, 124503 (2007), DOI 10.1063/1.2772269. Abstract and Introduction define the pulse delays and frequency labeling; Section II.B defines the center line and its orientation-dependent slope convention. The analysis relates a waiting-time-dependent slope observable to the frequency-frequency correlation function under stated approximations, and tests apodization with calculated spectra. A raw geometric fit correlation is not universally identical to a molecular dynamical correlation.
Additional response-factor locator: Section II.A, Eqs. 5–7, retains relaxation terms and distinct transition-dipole products in different third-order pathways; these are reasons to specify the observable and acquisition conditions rather than assume a universal population-response ratio. Section II.B specifies the center-line construction and inverse-slope convention. finkelsteinlab.org/assets/md/2007-09-28-frequency-frequency-correlation/ .
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