Scintillation

"Tron and Ram both leaned down over it and drank deeply from flowing scintillation. Tron, pausing, pronounced with great enjoyment, 'Ah, nice! You forget how good the power feels till you get to a pure source."
pg. 92

scin·til·la·tion

1. The act of scintillating.
2. A spark; a flash.
3. Astronomy Rapid variation in the light of a celestial body caused by turbulence in Earth's atmosphere; a twinkling.
4. Physics A flash of light produced in a phosphor by absorption of an ionizing particle or photon.

More:

1.(physics) a flash of light that is produced in a phosphor when it absorbs a photon or ionizing particle
natural philosophy, physical science, physics - the science of matter and energy and their interactions
light, visible light, visible radiation - (physics) electromagnetic radiation that can produce a visual sensation; "the light was filtered through a soft glass window"

2. a rapid change in brightness; a brief spark or flash
sparkling, twinkle, alteration, change, modification - an event that occurs when something passes from one state or phase to another; "the change was intended to increase sales"; "this storm is certainly a change for the worse"; "the neighborhood had undergone few modifications since his last visit years ago"

3. a brilliant display of wit
genius, brilliance - unusual mental ability

4. the quality of glittering or sparkling brightly
glisten, glister, glitter, sparkle
brightness - the location of a visual perception along the black-to-white continuum

5. the twinkling of the stars caused when changes in the density of the earth's atmosphere produce uneven refraction of starlight
wavering, fluctuation - the quality of being unsteady and subject to fluctuations; "he kept a record of price fluctuations"

Definitions from www.thefreedictionary.com
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