A Langmuir–Taylor detector, also called surface ionization detector or hot wire detector, is a kind of detector developed by Taylor based on the work of Langmuir and Kingdon.
This detector usually consists of a heated thin filament or ribbon of a metal with a high work function (typically tungsten or rhenium). Neutral atoms or molecules that strike the filament can boil off as positive ions and these may be either measured as a current or detected, individually, using an electron multiplier and particle counting electronics.
This detector is mostly used with alkali atoms, having a low ionization potential, with applications in mass spectrometry and atomic clocks.
See also 
- ^ Taylor, John (1930). "The Reflection of Beams of the Alkali Metals from Crystals". Physical Review 35 (4): 375–380. doi:10.1103/PhysRev.35.375.
- ^ Langmuir, Irving (1925). "Thermionic Effects Caused by Vapours of Alkali Metals". Proc. R. Soc. London, Ser. A 107: 61–79. doi:10.1098/rspa.1925.0005.