Angle between the trajectory of a particle or photon, as it leaves a surface, and the local or average surface normal.
Notes: - The particular surface normal needs to be specified.
- In XPS and other techniques, the take-off angle, which is referred to the sample surface, is quoted.
Source:
PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1797 (https://doi.org/10.1515/pac-2019-0404)