A scheme for the specific mass-spectrometer detection of radicals

Autor:	John H. Moore, Safa Motlagh
Rok vydání:	1999
Předmět:	Spectrometer Chemistry Radical Analytical chemistry chemistry.chemical_element Mass spectrometry Biochemistry Analytical Chemistry Ion Electrochemistry Mass spectrum Environmental Chemistry Molecule Tellurium Spectroscopy Electron ionization
Zdroj:	The Analyst. 124:1065-1068
ISSN:	1364-5528 0003-2654
Popis:	In most environments in which radicals occur, the precursor molecule is found in much higher concentrations than that of the radical. Mass-spectrometer detection of radicals is then essentially impossible because the mass-spectrometric signature of a radical is nearly identical to that of the parent. A new method for overcoming this difficulty has been demonstrated. This scheme is based upon the means by which radicals were first detected and involves the propensity for radicals to react with tellurium to produce volatile tellurides. A mass spectrometer can detect the tellurides thus produced in a region of the mass spectrum far removed from that of the radical’s precursor. This technique has been used in analyses for CH3, CF3, CF2H, CFH3, C2F5, and F at partial pressures as low as 2 × 10–8 Torr in the presence of the parent hydrofluorocarbons at five orders of magnitude greater pressures. Possible interferences by the neutral precursor, by ions, and by the products of reactions on the tellurium surface have been investigated.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::abeadebb66fe1ec1e0e3435663c60877 https://doi.org/10.1039/a901198f Zobrazit plný text záznamu