Abstract
Improved determinations of the ionization potential of molecular hydrogen are interesting both as tests of fundamental molecular physics and because of the novel technical challenges involved in making precise measurements deep in the UV. Last year we reported a new value of 124,417.524 cm−1 accurate to 1 part in 107, obtained by laser double resonance spectroscopy.1 Since then, we have made major improvements in the experimental design and have begun to extend the measurements to the other stable isotopes of molecular hydrogen, D2, and HD.
© 1990 Optical Society of America
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