The Neutralization of HeCmath image in the Gas Phase: Compelling Evidence for the Existence of an Endohedral Structure for He@C60


  • This research was supported by the Deutsche Forschungsgemeinschaft, the Fonds der Chemischen Industrie, and the Natural Sciences and Engineering Research Council of Canada (NSERC). Valuable discussions with Prof. D. K. Böhme and Dr. J. Hrušák are gratefully acknowledged.

  • Dedicated to Professor Fred W. McLafferty


Neutralization-reionization mass spectrometry was used to show that for both neutral He@C60 and He@Cmath image, the noble gas atom is incorporated within the fullerene cavity. The C60H˙+ ions were generated by high-energy collisions of Cmath image with quasi-stationary 4He target atoms and cleaved in the mass spectrometer by loss of C2 or multiples thereof, as is usual for endohedral MC60 complexes.