collision efficiency, \(B_{\text{c}}\)

Synonym: de-energization efficiency
https://doi.org/10.1351/goldbook.C01164
The collision efficiency, or de-energization efficiency, is defined by: \[k_{\text{-1}} = B_{\text{c}}\ k_{\text{-1}}^{\text{sc}}\] where \(k_{-1}\) is the @[email protected] for a particular substance \(\text{M}\) when it brings about the de-energization process
C01164.png
and \(k_{-1}^{\text{sc}}\) is the corresponding @[email protected] for a reference molecule \(\text{M}_{\text{r}}\) that de-energizes \(\text{A}^{*}\) on every collision; that is, the reference molecule \(\text{M}_{\text{r}}\) undergoes @[email protected], and by definition has a collision efficiency \(B_{\text{c}}\) of unity. The species \(\text{A}^{*}\) is usually in a [email protected]@, and \(\text{A}\) has energy less than that required for reaction to occur.
Source:
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 159 [Terms] [Paper]