Wiktionary
n. (context chemistry English) Any cation, of general formula X2+, formed by the removal of two electrons from a neutral species
Wikipedia
''' A dication is any cation, of general formula X, formed by the removal of two electrons from a neutral species.
Diatomic dications corresponding to stable neutral species (e.g. formed by removal of two electrons from H) often decay quickly into two singly charged particles (H), due to the loss of eBold textBold textBold textBold textBold textBold textBold textBold textBold textBold textBold textBold textBold textBold textBold text'''lectrons in bonding molecular orbitals. Energy levels of diatomic dications can be studied with good resolution by measuring the yield of pairs of zero-kinetic-energy electrons from double photoionization of a molecule as a function of the photoionizing wavelength (threshold photoelectrons coincidence spectroscopy – TPEsCO). The dication is kinetically stable.
An example of a stable diatomic dication which is not formed by oxidation of a neutral diatomic molecule is the dimercury dication . An example of a polyatomic dication is , formed by oxidation of S and unstable with respect to further oxidisation over time to form SO.
Many organic dications can be detected in mass spectrometry for example (a complex) and the acetylene dication . The adamantyl dication has been synthesized.
Usage examples of "dication".
I just # as you might say # cut the fat out" It was perhaps unfortunate that his eyes met DarnelTs at this moment, and that the airy circles his hand was sketching could have been taken for an in dication of DarnelTs growing paunch.