Talk:Electron capture ionization
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[edit]Hello, tThis is a thesis about this subject. Maybe, it could help to improve this article. Pamputt (talk) 11:25, 24 January 2015 (UTC)
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I thought the Resonance Electron Capture section could be improved. What do you mean, "The electrons can be created in the Electron Ionization source with moderating gas such as H2, CH4, i-C4H10, NH3, N2, and Ar."? Stabilize to stable?
I discovered this topic after trying to learn about negative ion mass spectrometry. It seems counter intuitive that electron capture should produce positive ions. Then again, does it? Resonance electron capture produces negative ions. I'm presuming they decompose to form positive ions in a chemical ionization process. I'm hoping someone might rewrite this topic a little more clearly. Petedskier (talk) 01:48, 16 October 2022 (UTC)PW
- Electron capture detector
- An electron capture detector most often uses a radioactive source to generate electrons used for ionization. Some examples of radioactive isotopes used are 3H, 63Ni, 85Kr, and 90Sr. The gas in the detector chamber is ionized by the radiation particles. Nitrogen, argon and helium are common carrier gases used in the ECD. Argon and helium need to be combined with another gas, such as methane, in order to prevent immediate conversion into metastable ions.
- In Electron Ionization, "By far the most common and perhaps standard form of ionization is electron ionization (EI). The molecules enter into the MS (the source is a quadrupole or the ion trap itself in an ion trap MS) where they are bombarded with free electrons emitted from a filament, not unlike the filament one would find in a standard light bulb."
- I wish someone would rewrite this. Is there something about 'Electron capture ionization' that is different from electron impact mass spectra? I thought EI MS were generated by electrons from a filament. The voltage was adjustable to 'soften' the electron energy and reduce fragmentation. Beta emission electrons should possess much greater energy. Obviously, I don't know about electron emission spectra from radioactive versus thermionic sources.
- This seems as though it should be part of Electron Ionization rather than a separate and unlinked stub (is that the term?). Then, it would make sense to distinguish these two electron ionization techniques. Petedskier (talk) 23:02, 21 October 2022 (UTC)