Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 27: Poster: Photoionization

A 27.5: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Photoionization and photofragmentation of multiply charged Lu₃N@C₈₀^q+ ions — •Jonas Hellhund¹, Sándor Ricz², Alexander Borovik Jr.¹, Kristof Holste¹, Stephan Klumpp³, Michael Martins³, Stefan Schippers¹, and Alfred Müller¹ — ¹I.A.M.P., Univ. Giessen, Germany — ²Atomki, Debrecen, Hungary — ³Experimental Physics, Univ. Hamburg, Germany

Photoionization and photofragmentation of Lu₃N@C₈₀^q+ (q=1,2,3) endohedral fullerene ions has been studied using the new Photon-Ion spectrometer at PETRA III (PIPE). Solid endohedral fullerene material was evaporated inside an ECR ion source. The generated ions were mass/charge selected and the ion beam was merged with the photon beam from PETRA III beamline P04. Product-ion yields normalized to ion current and photon flux, i.e., relative cross sections, were measured as a function of photon energy. The experimental photon-energy range was 270–1700 eV. This range comprises the energies for 1s ionization of carbon and nitrogen as well as for 3d-ionization of lutetium.

The measured spectra exhibit clear signatures of carbon K-shell excitation, but no signs of excitation or ionization of encapsulated N or Lu producing vacancies in the 1s and 3d shells, respectively, have been observed. This is in contrast to recent findings for photofragmentation of Xe@C₆₀⁺ [1] at energies of 60–150 eV. We speculate that the carbon cage and the encaged Lu₃N molecule completely disintegrate into relatively small fragments after absorption of one energetic photon.

[1] R. A. Phaneuf et al., Phys. Rev. A 88, 053402 (2013).