Quantum chemical contribution to electron neutrino mass determination

Theoretical data have been obtained needed to analyze the experimental measurements of the T2 β-decay energy distribution near the end point. The energies of the six lowest 1∑+ states of HeT+ have been computed for internuclear distances 1.0 ≦4 R ≦ 4.0 bohr. The wavefunctions have been used to calculate the transition probabilities to these states from the electronic ground state of T2. Distribution of the probabilities over the final vibrational and rotational states has been evaluated including rotationally predissociating resonances. Using the stabilization method the 1∑+ resonance states of HeT+ above the ionization limit have been investigated. Preliminary potential energy curves for several of these states have been determined for a wide range of internuclear distances.