Abstract
Precise measurements of deep ultraviolet transitions in atoms and molecules pose a special challenge to the spectroscopist because of the high order of nonlinearity required to measure a transition below 100 nm starting with a visible laser as the light source. This challenge is particularly compelling in the case of the hydrogen molecule, where precise calculations of the ionization potential with uncertainties of a few parts in 107 have gone largely untested because of the difficulty of measuring the 100 000 cm−1 interval from the ground state to the nearest excited states.
© 1990 Optical Society of America
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