Collisional energy transfer magnitude

One of the most striking aspects of resonant collisional energy transfer between Rydberg atoms is the magnitude of the cross sections. Accordingly, the first... 

Bemshtein, V. and Oref. I. (2001) The effect of magnitude and geometiy on the gateway frequencies for collisional energy transfer between benzene and Ar, J. Phys. Chem. A., 105, 10646-10650. 

The magnitude of collisional energy transfer from chemically activated molecular species is usually evaluated from graphs of decomposition to stabilization (D/S) ratios vs (pressure) and can be expressed in terms of a characteristic energy loss, e.g.,... 

Before proceeding, an important note must be made. In literature, two different but fully equivalent approaches have been taken in s.e. The first approach considers a cell that contains (unknown) numbers of donors and acceptors No and NA. When energy transfer takes place (be it from collisional encounters or because a stable population of FRET pairs exist with FRET efficiency E) this diminishes the effective number of emitting donors with Ns [3] that is, the FRET efficiency for this population is unity. Thus, the residual donor emission results from (No — Ns) unquenched donor molecules, and the Ns population emits only sensitized emission. This approach is intuitive in case no assumptions are being made on the presence of a stable population of FRET pairs or on the magnitude of E in a donor-acceptor complex. 

---