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In the last decades different types of storage cells have been used to increase the target density of polarized internal targets in storage rings, fed with atoms from an atomic beam source. Most of these cells are optimized to avoid recombination of the polarized hydrogen or deuterium atoms into molecules and to preserve the nuclear polarization at a high level between 0.75 and 0.9. Independently, groups at AmPS [1], IUCF [2], and HERMES [3] have shown that nucleons of recombined molecules can still be polarized. In a collaboration between the Petersburg Nuclear Physics Institute, the University of Cologne and the Forschungszentrum Jülich we have built a dedicated apparatus to measure the polarization of hydrogen(deuterium) atoms and molecules in cells of different surface materials for temperatures between 45 and 120 K and in magnetic fields up to 1 T. In addition, the recombination probability of atoms and the amount of wall bounces of molecules inside the cells have been measured with good precision. First results and possible options for further use will be presented.

Polarized Molecules: A new Option for Internal Storage-Cell Targets?