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In a cw laser spectroscopic experiment using a collimated atomic beam of barium we have excited the 5dnf J=4 and 5 autoionizing series. In transitions from the metastable 5d2 1G4 level inherently narrow autoionization linewidths, down to a Doppler-limited value of 10 MHz, have been observed. Assignment of all observed 5dnf transitions has been made. © 1987 The American Physical Society

Low autoionization rates in the[5dnf] J=4,5 doubly excited series in Ba i