Perhaps you should try some spelling variations:
"particle acceleraton" » "particle accelerator", "particles acceleration", "particle accelerations"
"particle accelerated" » "particles accelerated", "particle accelerator", "partially accelerated"
"particle accelerators" » "particle accelerator", "particle accelerate", "particle accelerating"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("particle acceleration") OR ((((("particle acceleraton") OR ("particle accelerators"))) OR ("particle accelerated")))).
• Removing quotes may allow a broader search: (( particle acceleration ) or ((((( particle acceleraton ) or ( particle accelerators ))) or ( particle accelerated )))).
• Adding a wildcard symbol may retrieve word variants: (("particle acceleration") or ((((("particle acceleraton") or ("particle accelerators"))) or ("particle accelerated"))))*.