| Автор | G M McCracken |
| Автор | J H C Maple |
| Дата выпуска | 1967-07-01 |
| dc.description | The trapping of hydrogen ions in molybdenum, titanium, tantalum and zirconium has been measured by a mass-spectrometric technique. Targets are bombarded by a mass-analysed ion beam of 10-100 μA at 3-30 kev in a target chamber at about 1 ntorr. The rise in partial pressure of hydrogen in the target chamber is measured during bombardment, and subsequently during thermal desorption. The absolute trapping efficiency can then be calculated from these two measurements.The trapping efficiencies have been measured as a function of ion dose and energy. It was found that Mo has initially a high trapping efficiency, but that the trapping efficiency rapidly decreases with dose and saturation is reached at about 10<sup>17</sup> ions/cm<sup>2</sup> at room temperature. Ti, Ta and Zr exhibit markedly different behaviour. Trapping efficiencies as high as 0·92 are observed and these are maintained constant with dose up to the maximum so far used of nearly 10<sup>19</sup> ions/cm<sup>2</sup>. No appreciable variation of the trapping efficiency with energy has been observed in the range investigated.These results have been interpreted in terms of a model which takes into account the diffusion coefficient of hydrogen in the metal and the potential barrier to hydrogen atoms at the surface. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | The trapping of hydrogen ions in molybdenum, titanium, tantalum and zirconium |
| Тип | paper |
| DOI | 10.1088/0508-3443/18/7/306 |
| Print ISSN | 0508-3443 |
| Журнал | British Journal of Applied Physics |
| Том | 18 |
| Первая страница | 919 |
| Последняя страница | 930 |
| Аффилиация | G M McCracken; The Culham Laboratory, Abingdon, Berks |
| Аффилиация | J H C Maple; The Culham Laboratory, Abingdon, Berks |
| Выпуск | 7 |
