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arXiv · 2509.13168

Thermal Cesium Release in PMTs Revealed by Resonant Laser Spectroscopy and Its Correlation with Quantum Efficiency

Antonio De Benedittis·Pasquale Migliozzi·Carlos Maximiliano Mollo·Andreino Simonelli
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Abstract

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.

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Antonio De Benedittis, Pasquale Migliozzi, Carlos Maximiliano Mollo, Andreino Simonelli. 2025-09-16. Thermal Cesium Release in PMTs Revealed by Resonant Laser Spectroscopy and Its Correlation with Quantum Efficiency. https://arxiv.org/abs/2509.13168

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