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Bibliographic Details
Main Authors:	De Benedittis, Antonio, Migliozzi, Pasquale, Mollo, Carlos Maximiliano, Simonelli, Andreino
Format:	Preprint
Published:	2025
Subjects:	Optics Instrumentation and Methods for Astrophysics High Energy Physics - Experiment
Online Access:	https://arxiv.org/abs/2509.13168
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Table of Contents:

We report optical evidence of cesium (Cs) evaporation from a bialkali (SbKCs) photo-cathode 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 degrees Celsius, indicating thermal desorption. The absorption correlates with temperature and offers a non-invasive method to monitor photocathode degradation in sealed detectors.