Abstract
Silver dimers Ag 2 formed in a seeded supersonic argon beam are excited into autoionizing Rydberg levels by resonant two-step transitions with two pulsed dye lasers. The three isotopes of Ag + 2 are separated by a time of flight mass spectrometer. From the convergence limits of different Rydberg series converging towards different vibrational levels ν + in the X 2Σ + g ground state of Ag + 2 the vibrational constants of the ion ground state and the adiabatic ionization potential IP(Ag + 2) = 61747 ± 4 cm −1 could be accurately determined.
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