Abstract
The visible emission spectrum of the water cation, H2O+, is a prominent feature in comet tails, and is often observed in laboratory discharges. However, until now the visible electronic spectrum has never been observed in absorption. We have used a tunable ring dye laser and a velocity-modulated discharge to detect the visible electronic spectrum in absorption, in H2O+ and D2O+.
© 1992 Optical Society of America
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