interaction distance

https://doi.org/10.1351/goldbook.I03075
The farthest distance of approach of two particles at which it is discernible that they will not pass at the @[email protected]
Source:
PAC, 1991, 63, 1541. (Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1555 [Terms] [Paper]