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As part of a bigger project we were given this image. Its a mass spectrum produced in an accelerator with a Boron cathode. It was implanted in diamond. I assume the first peak is just $B^-$ but I have no clue what the rest is. Any help would be appreciatedI ASSUME that the Y axis is current and the X axis is mass. I may be wrong.]

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  • $\begingroup$ Given that boron has two isotopes (10 and 11), and your low mass peak looks more like it is at mass 9, you indeed have some issues. Further, why a negative ion (unless you have a tandem accelerator and are just looking at the SNICS source)? $\endgroup$ – Jon Custer Jun 24 '19 at 16:48
  • $\begingroup$ It is indeed a SNICS source $\endgroup$ – Pablo Bähler Jun 24 '19 at 17:30
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    $\begingroup$ You said the spectrum taken with a boron cathode. It is seemingly, $\ce{^{10}B}$ enriched cathode and I clearly see the presence of $\ce{^{10}B3}$ (very weak), $\ce{^{10}B4}$ (weak), and $\ce{^{10}B5}$ (strongest) peaks. To assign peaks at 38 and 49, I need to know how was the cathode prepared (such as with $\ce{Ag}$ or $\ce{C}$ or etc.). $\endgroup$ – Mathew Mahindaratne Jun 24 '19 at 17:34
  • $\begingroup$ The supervisors for the experiment did not tell us anything about the preparation, it is a side task for the main experiment, which is implantation of ions in diamond to create nitrogen vacancy centers. $\endgroup$ – Pablo Bähler Jun 24 '19 at 18:57
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    $\begingroup$ @MathewMahindaratne - But I see no indication of a $B_{2}^{-}$ peak, which shows up clearly in the scans in the Negative Ion Cookbook. But, yes, the OP should clarify what cathode was used. $\endgroup$ – Jon Custer Jun 24 '19 at 19:00

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