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Daly detector

Daly detector

Daly detector schematic
Inventor N. R. Daly
Related Microchannel plate detector
Electron multiplier

A Daly detector is a gas phase ion detector that consists of a metal "doorknob", a scintillator (phosphor screen) and a photomultiplier.[1] It was named after its inventor N. R. Daly. Daly detectors are typically used in mass spectrometers.

How it works

Ions that hit the doorknob release secondary electrons. A high voltage (ca. -20,000 V) between the doorknob and the scintillator accelerates the electrons onto the phosphor screen where they are converted to photons. These photons are detected by the photomultiplier.

The advantage of the Daly detector is that the photomultiplier can be separated by a window, which lets the photons through from the high vacuum of the mass spectrometer, which an otherwise possible contamination prevented and which extends detector life span. The Daly detector also allows for a higher acceleration after the field free region of a time-of-flight mass spectrometer flight tube, which can improve the sensitivity for high mass ions.


  1. ^ N. R. Daly, Scintillation Type Mass Spectrometer ion Detector. Rev. Sci. Instr. 3, 31, 264-267 (1960).
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Daly_detector". A list of authors is available in Wikipedia.
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