scintilla

HI scintilla    [sin-Til-uh] 

noun.  tiny bit of something 

"There was not a scintilla of evidence that he was engaged in any kind of criminal activity."

"Major league baseball Commissioner Bud Selig said that he had absolutely not a scintilla of doubt that the  finances of the two New York teams are doing fine."

"The atom will emit a scintilla of light, which will be picked up by the machine’s ultra-sensitive sensors."