Everything about Sector Instrument totally explained
A
sector instrument is a general term for a class of
mass spectrometer that utilizes a static electric or magnetic sector or some combination of the two (separately in space) as a mass analyzer. A popular combination of these sectors has been the BEB (magnetic-electric-magnetic). Most modern sector instruments are double focusing instruments in that they focus the ion beams both in direction and velocity.
Theory
The behavior of ions in a homogeous, linear, static electric or magnetic field (separately) as is found in a sector instrument is simple. The
physics are described by a single equation called the
Lorentz force law. This equation is the fundamental equation of all mass specrometric techniques and applies in non-linear, non-homogeneous cases too and is an important equation in the field of
electrodynamics generally.
» radians) electric sector, a drift length which is followed by a 90° magnetic sector of opposite curvature direction. The entry of the ions sorted primarily by charge into the magnetic field produces an energy focussing effect and much higher transmission than a standard energy filter. This geometry is often used in applications with a high energy spread in the ions produced where sensitivity is nonetheless required, such as spark source mass spectrometry (SSMS) and secondary ion mass spectrometry (SIMS).
The advantage of this geometry over the Nier-Johnson geometry is that the ions of different masses are all focused onto the same flat plane. This allows the use of a photographic plate or other flat detector array.
Nier-Johnson
The Nier-Johnson geometry consists of a 90° electric sector, a long intermediate drift length and a 60° magnetic sector of the same curvature direction.
Hinterberger-Konig
The Hinterberger-Konig geometry consists of a 42.43° electric sector, a long intermediate drift length and a 130° magnetic sector of the same curvature direction.
Takeshita
The Takeshita geometry consists of a 54.43° electric sector, and short drift length, a second electric sector of the same curvature direction followed by another drift length before a 180° magnetic sector of opposite curvature direction.
Matsuda
The Matsuda geometry consists of a 85° electric sector, a quadrupole lens and a 72.5° magnetic sector of the same curvature direction.
Further Information
Get more info on 'Sector Instrument'.
|
External Link Exchanges
Do you know how hard it is to get a link from a large encyclopaedia? Well we're different and will prove it. To get a link from us just add the following HTML to your site on a relevant page:
<a href="http://sector_instrument.totallyexplained.com">Sector instrument Totally Explained</a>
Then simply click through this link from your web page. Our crawlers will verify your link, extract the title of your web page and instantly add a link back to it. If you like you can remove the words Totally Explained and embed the link in article text.
As long as your link remains in place, we'll keep our link to you right here. Please play fair - our crawlers are watching. Your site must be closely related to this one's topic. Any kind of spamming, dubious practises or removing the link will result in your link from us being dropped and, potentially, your whole site being banned. |
