Term: collision cross-section, \(\sigma\)
https://doi.org/10.1351/goldbook.C01161

Definition:
In simple hard sphere collision theory the area of the circle with radius equal to the collision diameter.

Related Terms:
1) collision theory (http://doi.org/10.1351/goldbook.C01170).
2) collision diameter (http://doi.org/10.1351/goldbook.C01163).

Source: Green Book, 2nd ed., p. 56 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)

Citation: 'collision cross-section, \(\sigma\)' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.C01161

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