Abstract

The dc Stark effect is studied for autoionising Rydberg states of H 2 converging on the ν +=2 ionisation limit. The levels ( n = 13–22) are excited from the ground state using a coherent XUV source (bandwidth ≈ 1 cm −1) and are strongly perturbed by the field (15–2000 V/cm). Many new states are observed, including the high-/hydrogenic manifolds. A detailed Stark map is obtained for the first time, and a matrix diagonalisation calculation of field-induced state mixing is carried out to explain some of the observed features.

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