External Properties of Atomic Nuclei Äussere Eigenschaften der Atomkerne Breitscheidstr. 10 The participation of the European Jr The participation of the European Community and the Member States in the international climate change regimes is a complex issue Groth) to the observations of the optical counter part of X ray sources (P If the molecule possesses a permanent electric dipole moment it can absorb a quantum of microwave energy hv and make a transition to a higher rotational' state governed by the selection rules L1 I = + 1 The program of mass determination from microwave spectra is to correlate this frequency shift with the change in mass of the substituted isotope