Paul Trap at IQOQI Innsbruck (image) University of Sydney Share Print E-Mail Caption This is the Paul trap used for Dr Cornelius Hempel's experiment at IQOQI Innsbruck. Credit M.R. Knabl / IQOQI Innsbruck Usage Restrictions For this story only. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.