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Citations since 2017
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Accelerated corrosion leading to system failure has been observed on printed circuit boards present in industrial environments that contain abnormal levels of reduced sulfur gasses, such as hydrogen sulfide (H2S) and elemental sulfur. The problem is compounded by the fact that elemental sulfur is regulated by OSHA as a nuisance dust, and is allowed...
The effect of different buffer gases on the intensity of negative ions was studied using a gas chromatography/electron monochromator mass spectrometer (GC/EM-MS). The buffer gas was introduced into the ion source not to moderate the electron energies, but specifically to investigate the process of collisional stabilization of negative ions. Three d...
The interaction of low-energy electrons with eight phthalates was studied using an electron monochromator−mass spectromer (EM−MS). Each phthalate captures electrons of discrete energy to yield negative ions by resonance or dissociative electron capture. Two negative ion resonances are generally observed for each ion. Electrons with energies of 0.6...
Regiospecifically chlorine-37-labeled polychlorodibenzo-p-dioxins (PCDDs) undergo electron energy-dependent regioselective chloride ion loss when analyzed by electron capture negative ion mass spectrometry using an electron monochromator to supply the slow monoenergetic electrons. Three negative ion resonances, produced with electrons of energies <...
Electron monochromators designed for the production of low-energy electrons (0–15 eV) with nearly monoenergetic distributions have been available for many decades. The concept of adapting the electron monochromator as an ion source onto mass spectrometers for the purpose of electron capture negative ion-mass spectrometric (ECNI-MS) analyses is only...
An electron monochromator mass spectrometer was used to study the resonant electron energies versus negative ion masses of the organophosphate insecticides dicapthion, EPN, ethion, fenitrothion, leptophos, leptophosoxon, paraoxon, and parathion. Each compound yielded a unique two-dimensional electron energy/mass spectrum. The most abundant ions are...