Near- and mid-IR absorption spectra of endohedral H2@C60+ have been measured using He-tagging. The samples have been prepared using a "molecular surgery" synthetic approach and were ionized and spectroscopically characterized in the gas phase. In contrast to neutral C60 and H2@C60, the corresponding He-tagged cationic species show distinct spectral differences. Shifts and line splittings in the near- and mid-IR regions indicate the influence of the caged hydrogen molecule on both the electronic ground and excited states. Possible relevance to astronomy is discussed.

Department of Organic Chemistry Faculty of Science Charles University Prague 12843 Prague 2 Czech Republic

Department of Physics University of Technology 09107 Chemnitz Germany

Division of Physical Chemistry of Microscopic Systems Karlsruhe Institute of Technology Karlsruhe Germany

Institute for Chemical Research Kyoto University Kyoto 611 0011 Japan

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Electronic spectra of ions of astrochemical interest: from fast overview spectra to high resolution