Abstract
Thermal helium desorption spectrometry (THDS) has been ultilised to study the interaction between nitrogen and vacancies in molybdenum. The main aim of the investigation has been (1) to corroborate previously obtained results by applying novel defect assignment methods, and (2) to clarify the helium desorption behaviour of vacancy clusters filled with nitrogen in molybdenum. The result of previous work that detrapping of nitrogen from a single vacancy in molybdenum requires an activation energy of ( 2.55 ± 0.05) eV is confirmed. The helium desorption behaviour of vacancy clusters filled with nitrogen is found to be identical to the helium desorption behavior of vacancy clusters without nitrogen. Small vacancy clusters containing more than one nitrogen atom have been observed, which are stable up to annealing temperatures of ~ 1100 K (annealing rate 40 K/s). The main influence of nitrogen on vacancies and vacancy type clusters is that it strongly promotes the thermal stability of the defects.
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