Ion trap

).

An ion trap mass spectrometer may incorporate a Penning trap (Fourier transform ion cyclotron resonance) [cite journal | title = High-accuracy mass spectrometry with stored ions | author = Blaum, Klaus | journal = Physics Reports | volume = 425 | issue = 1 | pages = 1–78 | year = 2006 | doi = 10.1016/j.physrep.2005.10.011 ] , Paul trap [cite journal | title = Linear ion traps in mass spectrometry | journal = Mass Spectrometry Reviews | author = Douglas, D.J. | coauthors = Frank, AJ; Mao, DM | volume = 24 | issue = 1 | pages = 1–29 | year = 2005 | doi = 10.1002/mas.20004 ] or the Kingdon trap. [cite journal | author=Kingdon KH | title=A Method for the Neutralization of Electron Space Charge by Positive Ionization at Very Low Gas Pressures| journal=Physical Review | volume=21 | pages=408–418 | url=http://link.aps.org/abstract/PR/v21/p408 | doi=10.1103/PhysRev.21.408 |year = 1923 ] The Orbitrap, introduced in 2005, is based on the Kingdon trap [cite journal | title = The Orbitr

journal = Journal of Mass Spectrometry | year = 2005 | volume = 40 | issue = 4 | pages = 430–443 | last = Hu | first = QZ | coauthors = Noll, RJ; Li, HY; Makarov, A; Hardman, M; Cooks, RG | doi = 10.1002/jms.856 ] . Other types of mass spectrometers may also use a linear quadrupole ion trap as a selective mass filter.

In an electron gun (a device emitting high-speed electrons, such as those in CRTs), an ion trap may be implemented above the cathode (using an extra, positively-charged electrode between the cathode and the extraction electrode) to prevent its degradation by positive ions accelerated backward by the fields intended to pull electrons away from the cathode.

Ion traps were also used in early television receivers, prior to the introduction of aluminized CRT faces in approximately 1958. The ion trap must be delicately adjusted for maximum brightness.

See also

* Trapped ion quantum computer

References

External links

* [http://www.vias.org/science_cartoons/ion_trap.html VIAS Science Cartoons] A cranky view of an ion trap...