Technical Comments

Comment on “Engineering coherence among excited states in synthetic heterodimer systems”

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Science  06 Jun 2014:
Vol. 344, Issue 6188, pp. 1099
DOI: 10.1126/science.1250926

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Hayes et al. (Reports, 21 June 2013, p. 1431) used two-dimensional (2D) electronic spectroscopy to study molecular heterodimers and reported a general mechanism for the prolongation of electronic coherences, consistent with previous interpretations of 2D spectra for light-harvesting systems. We argue that the dynamics attributed to electronic coherences are inconclusive based on experimental inconsistencies arising from limited sample characterization and insufficient control measurements.

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