“…Two of the triplet states are repulsive and the other two are bound in the inner region. In what follows, the states 1 1 A , 2 1 A , 1 1 A , and 2 1 A will be referred to as X, A, B, and C, respectively, and the triplet states 1 3 A , 1 3 A , 2 3 A , and 2 3 A will be termed a, b, c, and d (see Table I). …”