Surface ionization is a process in which an atom or molecule with a low ionization potential, in contact with a hot metal surface with a high work function, transfers an electron to the surface and is evaporated as a positive ion. alkali-containing compounds in common smokes and dusts are… More

Extranuclear laboratories will investigate a detector for ions in a mass spectrometer in which ions are accelerated tohigh energy and then permitted to strike a metal surface, where they produce secondary electrons. the electrons are then accelerated to a scintillator where they produce photons to… More

This proposal is for the construction of an advanced flowing afterglow apparatus with sufficient pumping speed to handle both neutral-neutral and ion-neutral reaction rate coefficient measurements. three neutral-neutral flow tubes of different diameters are provided to be able to assess wall… More

Pyrolysis-plus-surface ionization (ppsi) is a technique wherein a particle is impacted onto a hot catalytic surface with high work function, where the particle decompses and those of its atoms with low ionization potentials leave the surface as a burst of positive ions which can be detected asa… More

This proposal is for the design, prototype construction and testing of membrane interfaces which can be used with mass spectrometers for continuous water monitoring. this idea is based on the selectivity of semi-permeable membranes. the membrane interface is a relatively simple and inexpensive… More

This research will design and construct the preprototype of an ultrasensitive ion source that can be easily interfaced to quadrupole mass spectrometers for real-time trace constituent detection. the design will be based on the combination of preconcentration and recombination-limited, low-pressure… More

This grant is for the design and a prototype construction ofan ion source for mass spectrometers for ultratrace detection of trace constitutents. this source will be able to detect trace constituents in the ppt range in the presence of other analytes in the high ppb or ppm range. inpresently… More