Abstract
Experiments have been performed which indicate that by directly heating lithium hydride in a vacuum, up to 18 μA/cm2 of negative hydrogen can be obtained from the crystal lattice. Sample temperatures reached a maximum of about 800 °C. The amount of ion current extracted and analyzed is closely related to the temperature of the sample and to the rate at which the temperature is changed. The ion current appears to be emission limited and saturates with extraction voltage. For a fixed extraction voltage, the ion current could be maximized by placing a grid between the sample surface and the extraction electrode. Electrons accompanying the negative ions were removed by a magnetic trap. A Wien velocity filter was designed and built to provide definitive mass analysis of the extracted ion species.
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