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These sources, when run on refractory metal needles and heater ribbons, have exhibited high angular intensity (1.5–5 μA/sr), long lifetime (>150 h), low energy spread (eV), and stable operation with extracted currents down to 2 μA."},{"label":"DOI","value":"10.1116/1.583862"},{"label":"Volume","value":"5"},{"label":"Issue","value":"1"},{"label":"Publication Date","value":"D:00 M:00 Y:1987"},{"label":"Publication Information","value":"Copyright 1987 American Vacuum Society. 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