in chemistry, a chemical trap is a chemical compound that is used to detect a certain molecule when Chemistry (in Greek: χημεία) is the science of matter and its interactions with energy and itself (see physics, biology). ... A chemical compound is a chemical substance formed from two or more elements, with a fixed ratio determining the composition. ... In science, a molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties. ...
the concentration of this molecule is very small and below detection limit
the molecule is very reactive and it not possible to isolate or detect it by spectroscopic means
With the reaction product of the chemical trap and the molecule in question it is possible to Concentration is a very common concept used in chemistry and related fields. ... Spectroscopy is the study of spectra, that is, the dependence of a physical quantity to frequency. ... In chemistry two stereoisomers are said to be enantiomers if one can be superimposed on the mirror image of the other, and vice versa. ... In chemistry, a racemate is a mixture of equal amounts of left- and right-handed stereoisomers of a chiral molecules. ...
While prior art positions the hot trap upstream of the exhaust pump to avoid damage to the pump, it was found that there was no significant damage to the exhaust pump by having the pump connected directly to the process chamber.
The cold trap cools the chamber to a temperature in the range from 25 degrees to minus 200 degrees Celsius.
In other aspects of the invention, the hot trap includes a second input port to accept a catalyst selected from the group consisting of water, alcohol, and ammonia whereby the catalyst furthers the chemical reaction in the first chamber.
The ions then exited the trap because of space-charge repulsion (or were ejected by a suitable voltage pulse to one of the end-caps) and were mass-analyzed by a conventional quadrupole.
The field required for trapping is formed by coupling the RF voltage between the ring electrode 11 and the two end cap electrodes 12 and 13 which are common mode grounded through coupling transformer 32 as shown.
According to the present invention the ion trap is operated in the chemical ionization mode as follows: Reagent gases are introduced into the trap at pressures between 10.sup.-8 and 10.sup.-3 torr and analytic gases are introduced into the ion trap at pressures between 10.sup.-5 and 10.sup.-8 torr.
Feeds |
Contact