Elizabeth McCormack, Jonathan Mark Gilligan, Christian Cornaggia, & Edward Eugene Eyler, Measurement of high Rydberg states and the ionization potential of H$_2$, Physical Review A 39, 2260–2263 (1989). PDF Abstract:
Elizabeth McCormack, Jonathan Mark Gilligan, Christian Cornaggia, & Edward Eugene Eyler, Measurement of high Rydberg states and the ionization potential of H$_2$, Physical Review A 39, 2260–2263 (1989). PDF