of or relating to changes in the energy levels associated with the vibrational motion of molecules.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
physics of, concerned with, or involving both electronic and vibrational energy levels of a moleculea vibronic spectrum; a vibronic transition
Word Origin for vibronic
C20: from vibr (atory + electr) onic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012