Langmuir–Taylor detector

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A Langmuir–Taylor detector, also called surface ionization detector or hot wire detector, is a kind of detector developed by Taylor[1] based on the work of Langmuir and Kingdon.[2]

Construction[edit]

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 in a process known as surface ionization, and these may be either measured as a current or detected, individually, using an electron multiplier and particle counting electronics.

Applications[edit]

This detector is mostly used with alkali atoms, having a low ionization potential, with applications in mass spectrometry and atomic clocks.

References[edit]

  1. ^ 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. 
  2. ^ Langmuir, Irving (1925). "Thermionic Effects Caused by Vapours of Alkali Metals". Proceedings of the Royal Society A. 107: 61–79. doi:10.1098/rspa.1925.0005.