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The electronic structure of positronium hydride has been studied using explicitly correlated Gaussian functions. The resulting energy constitutes new upper bound to the exact nonrelativistic energy of PsH within the Born–Oppenheimer approximation. The two photon annihilation rate was computed using the optimized wave function. Preliminary results for the positron bonded with the lithium atom indicate the stability of this system against the dissociation into Li+ cation and Ps atom.

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Potential energy curves for interactions of antihydrogen atoms with singlet and triplet states of helium atom and helium cation have been calculated within the adiabatic approximation. The leptonic Schrödinger equation was solved variationally with the basis of explicitly correlated Gaussian functions. Adiabatic corrections have been calculated with the Born–Handy method. For the and systems, critical distances have been found to be below 1.7 bohr and 1.0 bohr and the rearrangement cross sections have been computed with the semiclassical method. The possible existence and structure of complex atomcules is discussed.

4) have been investigated. The structures of complexes 1, 2, and 3, have been determined by Xray crystallography. Compound 1 is a distorted trigonal-bipyramidal complex and compounds 2 and 3 adopt a distorted tetrahedral structure. Complex 1 is a single-strand polymer with a bridging 3,4-diaminobenzoato ligand coordinating via the O(1) atom of the carboxylato group and the nitrogen atom [a]