Wahrhaftig diagram

IUPAC RECOMMENDATIONS 2013
Wahrhaftig diagram
Diagram illustrating the relative contributions in unimolecular dissociation of an ion, for example, by homolytic cleavage of a single bond, and fragmentation following rearrangement. The diagram is in two parts with a common horizontal axis representing the internal energy of the ion. The vertical axis in one part of the diagram shows the two types of rate constant on a logarithmic scale, and that for the other portion of the diagram indicates the distribution function for internal energy of the ion.
Related Term(s):
Reference(s): F. W. McLafferty, F. Turecek. Interpretation of Mass Spectra, University Science Books, Mill Valley, CA (1993). A. G. Brenton, R. P. Morgan, J. H. Beynon. Ann. Rev. Phys. Chem. 30, 51 (1979). (http://dx.doi.org/10.1146/annurev.pc.30.100179.000411 )
From Definitions of Terms Relating to Mass Spectrometry (IUPAC Recommendations 2013); DOI: 10.1351/PAC-REC-06-04-06 © IUPAC 2013.
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Gallery

The Wahrhaftig diagram showing the relationship between internal energy and unimolecular ion decomposition for a hypothetical ion ABCD+. Modeled after Figure 7.1 in "Interpretation of Mass Spectra" 4th ed. by McLafferty and Turecek.[1]