Abstract
Layers of lithium fluoride (LiF), ∼10 nm thick, were field desorbed from iridium substrates at temperatures between 25 and 600 °C. The electric field was increased until desorption of the salt layer occurred. Combined mass spectroscopy and field desorption microscopy characterized the desorption process. During desorption, ions of the form (LiF)n⋅Li+, n=1–4 are created. The field strength required for desorption is higher at lower temperatures and decreases as the temperature of the substrate is increased. Evidence for a piecewise removal of the LiF layer is presented. For thick salt layers, Li+ ions are frequently detected. An ion production mechanism based on ionic conduction of a salt layer in a high electric field is presented.
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Schedule a callMore From: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films
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