Inhalt des Dokuments
Size and shape selected pristine diamondoids in the gas phase are optimal interaction-free systems for the investigation of electronic properties of molecular clusters. The first diamondoid, adamantane, consists of the smallest possible single cage unit excised from the diamond lattice, with each dangling bond terminated by hydrogen atoms. Each subsequent diamondoid adds one additional face-fused cage. While lower diamondoids (ada-, dia-, and triamantane) can be chemically synthesized, higher diamondoids (tetramantane and larger) became available very recently by extraction from petrol and isolation by means of high performance liquid chromatography [Dahl, 2003]
Diamondoids combine several very attractive properties, such as extreme mechanical hardness, stability against chemical reagents, broad optical transparency and high thermal conductivity. Thanks to the possibility to chemically functionalize their surface, diamondoids and their derivatives exhibit interesting, technological relevant properties which range from high efficiency field emitters in molecular electronics to medicinal use.
The recent progress in production and functionalization of diamondoids and their potential to form hybrids, provides unique opportunities to study the electronic structure, binding and optical properties. Our spectroscopic methods include absorption and emission spectroscopy for the study of unoccupied electronic states and the radiative processes, as well as valence photoelectron spectroscopy for the investigation of the structure of occupied states.
For the study of size-selected diamondoid-metal hybrids a linear ion trap is available.
Selected publications from our group:
 R. Richter, et al. Phys. Chem. Chem. Phys. 16, 3070-3076 (2014)
Size and Shape dependent Photoluminescence and Excited-State Decay Rates of Diamondoids
 T. Zimmermann, et al. J. Chem. Phys. 139, 084310 (2013)
Exploring covalently bonded diamantane particles with valence photoelectron spectroscopy
 T. Rander, et al. J. Chem. Phys. 138, 024310 (2013)
Electronic structure tuning of diamondoids through functionalization
Further related publications:
[Dahl, 2003] Dahl, et al. Science 299, 96-99 (2003)
Isolation and Structure of Higher Diamondoids, Nanometer-Sized Diamond Molecules