exciton

[ik-sahy-ton, ek-si-ton]
noun Physics.
a localized, mobile excited state of a crystal, consisting of an electron and a hole bound together.

Origin:
1935–40; excit(ed) or excit(ation) + -on1

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World English Dictionary
exciton (ˈɛksaɪˌtɒn)
 
n
a mobile neutral entity in a crystalline solid consisting of an excited electron bound to the hole produced by its excitation
 
[C20: from excit(ation) + -on]

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Encyclopedia Britannica
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exciton

the combination of an electron and a positive hole (an empty electron state in a valence band), which is free to move through a nonmetallic crystal as a unit

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Once on the surface, some of the exciton energy is channeled into desorption of neutral oxygen atoms at high speed.
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