Ard، نويسنده , , S. J. Garrett and N. Peake، نويسنده , , W.R. and Compton، نويسنده , , R.N. and Adamowicz، نويسنده , , L. and Stepanian، نويسنده , , S.G.، نويسنده ,
Rotational states of dipole-bound anions of HCN are studied both experimentally and theoretically. The ground state experimental electron affinity (ea), 1.56 meV, is in good agreement with present and one earlier theoretical value. The predicted binding energy for the J = 1 state, 1.2 meV, is observed, whereas J = 2 is too fragile for observation and J = 3 is unbound.