Packing fraction

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DRAFT DEFINITION
Packing fraction
Obsolete Mass defect of an atom divided by its mass number and expressed as parts per 10,000.
Related Term(s): mass defect
Reference(s):

F. W. Aston, "Atoms and Their Packing Fractions" Nature 120, 956 (1927), http://dx.doi.org/10.1038/120956a0

This is an unofficial draft definition presented for information and comment.

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References

"The most convenient and informative expression for the divergences of an atom from the whole number rule is the actual divergence divided by its mass number. This is the mean gain or loss per proton when the nuclear packing is changed from that of oxygen to that of the atom in question. It will be called the packing fraction of the atom and expressed in parts per 10,000."
"In 1927 Aston published his measurements of the deviations of the nuclidic weights from integers in the form of a packing fraction curve that reflects the variation of the binding energy per nucleon with the number A of nucleons in the various nuclides."

Mass defect

Mass defect in mass spectrometry and nuclear physics

Mass defect (mass spectrometry)
The difference between the exact mass and the nearest integer mass
Mass defect (physics)
The difference between the mass of a composite particle and the sum of the masses of its parts

Links

Land, A. Neutrons in the Nucleus. I. Phys. Rev. 43, 620-623 (1933).
http://dx.doi.org/10.1103/PhysRev.43.620
Carlson (1960); High Resolution Mass Spectrometry. Interpretation of Spectra of Petroleum Fractions
http://dx.doi.org/10.1021/ac60167a032
Kendrick (1963); A Mass Scale Based on CH2= 14.0000 for High Resolution Mass Spectrometry of Organic Compounds.
http://dx.doi.org/10.1021/ac60206a048
Hughey (2001); Kendrick Mass Defect Spectrum:? A Compact Visual Analysis for Ultrahigh-Resolution Broadband Mass Spectra
http://dx.doi.org/10.1021/ac010560w
Zhang (2003); A software filter to remove interference ions from drug metabolites in accurate mass liquid chromatography/mass spectrometric analyses
http://dx.doi.org/10.1002/jms.521
Hall, M.P., Ashrafi, S., Obegi, I., Petesch, R., Peterson, J.N., Schneider, L.V. Mass defect tags for biomolecular mass spectrometry. J. Mass Spectrom. 38, 809-816 (2003).
http://dx.doi.org/10.1002/jms.493
Zhang (2009); Mass defect filter technique and its applications to drug metabolite identification by high-resolution mass spectrometry
http://dx.doi.org/10.1002/jms.1610
Sleno (2012); The use of mass defect in modern mass spectrometry
http://dx.doi.org/10.1002/jms.2953
Pourshahian (2017); Mass Defect from Nuclear Physics to Mass Spectral Analysis
http://dx.doi.org/10.1007/s13361-017-1741-9