Abstract
The authors observed a highly resolved structure (0.07 AA) in the spectrum of Na2+ ions formed in a Na vapour (1.2*1013 cm-3) irradiated by an intense non-resonant laser light (5*106 W cm-2). It is clearly demonstrated experimentally, by superheating of the vapour, that the ion yield should be attributed to a molecular three-photon ionisation process resonantly enhanced by excited intermediate rovibrational levels of Na2.
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