Abstract
A partial summation of the Born series for the transition operator, retaining only the contributions from intermediate states on the energy shell, is shown to yield a unitary S matrix and to be equivalent to the use of the first Born approximation for the reaction matrix. For the distorted-wave Born series the results provide an improved approximation for fast (i.e. sudden) molecular collisions.
| Original language | English |
|---|---|
| Article number | 303 |
| Pages (from-to) | 839-842 |
| Number of pages | 4 |
| Journal | Journal of Physics B: Atomic and Molecular Physics |
| Volume | 2 |
| Issue number | 8 |
| DOIs | |
| State | Published - 1969 |