G
o
o
g
l
e
×
Please click
here
if you are not redirected within a few seconds.
All
Images
Shopping
Videos
Maps
News
Books
Search tools
Any time
Any time
Past hour
Past 24 hours
Past week
Past month
Past year
All results
All results
Verbatim
Doubly ionized oxygen
View all
In astronomy and atomic physics, doubly ionized oxygen is the ion O²⁺. Its emission forbidden lines in the visible spectrum fall primarily at the wavelength 500.7 nm, and secondarily at 495.9 nm.
Wikipedia