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where the increase in kinetic energy is entirely due to the interference effect which raises the energy in the antisymmetric linear combination. However, for heteronuclear molecules this increase is also due to promotion energy which enhances the maximum of the antibonding kinetic energy curve at normal bond distances.A generalization of the present results, of course, cannot be made without strong reservations. However, they may be taken as basis for a discussion of more complicated molecules which should include electronic repulsions. Such investigations would also have special interest in electronic spectroscopy. Since electronic transitions in particular occur between the highest occupied and the lowest empty orbital states which are essentially antibonding in character it is important for an understanding of these transitions if these are mainly due to a change in kinetic energy of the electrons. Moreover, if destabilization due to nodes in the electronic density is the main contribution to the total energy, it would be the kinetic energy which determines the order of antibonding orbitals in the orbital energy scheme. These questions, however, can only be settled if further results on more complex molecules are available. The high-field rotational Zeeman effect has been observed in several rotational transitions of the (010) vibrational state in OCS and HCN. The magnetic-field splittings are in agreement with a simple first-order energy expression which is derived to hold for the Zeeman energies of rotationvibrational states of a linear polyatomic molecule showing rotational /-type-doubling. In this way, the presence of intrinsic magnetic moments in the ^r-vibrational states has been shown experimentally. The ^-values along the molecular axis are = +0.061 ±0.002 for OCS and ±0.38 ±0.06 for HCN. No magnetic anisotropics could be detected within the plane perpendicular to the molecular axis. The other parameters measured are = -0.0285 ± 0.0006 and X\\) (010> = (8.0 ±1.0) x 10-« erg/G 2 mole for OCS and g? 10 ' = + 0.100 ±0.001 for HCN which "can be considered an approximate value for the vibrational ground-state. Either the upper or the lower signs hold for the ^-values of HCN. The intrinsic ^-values, <7 <010) , are discussed in terms of nuclear and electronic contributions. A quantity measuring the slip of a rotating nuclear framework within its electronic environment is defined and also discussed. Acknowledgements

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Die fruher milgeteilten Untersuchungen iiber die Anlagerung van Quecksilber(JI1)-acetat an Methylester einfach ungesattiyter Fettsauren werden auf Diene und Triene ausgedehnt. Vollstandig methoxymerkurierte Ester der Ulsaure, Linolsaure und Linolensaure lassen sich durch Adsorptions-Chromatographie schon in einern Arbeitsgang fast vollstandig voneinander trennen. Aus den Addukten gewinnt man die ursprunglichen Ester ohne lsomerisierung zuriick.