Feshbach resonances of the H − 3 and D − 3 anions

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Based on a series of ab initio calculations two Feshbach resonances of the H − 3 negative ion having λ(1 sa′1)2(2sa′1)2−μ(1sa′1)2(2pa′′2)2: 1 A′1 and (1sa′1)2(2sa′1)(2pa′′2): 3 A′′2 electronic structure and estimated lifetimes of more than 10−14 s are predicted. The potential energy surfaces of the Feshbach states are roughly parallel to those of the Rydberg states of neutral H 3 and show minima located between the dissociative 2pE′ ground state surfaces and the lowest Rydberg states 2sA′1 and 2pA′′2 of H 3. We have determined a number of vibrational levels of the non-rotating molecules H − 3 and D − 3 and we predict electron affinities for the mentioned two Rydberg states.