Thermal cesium release in PMTs revealed by resonant laser spectroscopy and its correlation with quantum efficiency
Abstract
Abstract We report optical evidence of cesium (Cs) evaporation from a bialkali (SbKCs) photocathode during controlled heating of a photomultiplier tube (PMT). A DFB laser scanned across the 852.113 nm Cs D2 line reveals absorption features only above 60 ∘ C, indicating thermal desorption. The absorption correlates with temperature and offers a non-invasive method to monitor photocathode degradation in sealed detectors.
Fields of Study & Subjects
Photocathodes and Microchannel Plates
Radiation Detection and Scintillator Technologies
Particle Detector Development and Performance
Publication details
- Journal / source
- Journal of Instrumentation
- Volume
- 21
- Issue
- 01
- Pages
- P01013–P01013
- Publication date
- 1 January 2026
- Language
- EN