collision diameter, \(d\)
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https://doi.org/10.1351/goldbook.C01163
In simple hard sphere collision theory the sum of radii of two colliding spherical particles.
See also:
collision cross-section
Source:
Green Book, 2
nd
ed., p. 56 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)