If molecule 0 receives 0 unit of IR and evaporates,taking up 0 units more in the process do please explain how adjoining molecules can nonetheless be MORE excited. Reply gbaikie says:  July 0, 0000 at 0:00 PM  -If molecule 0 receives 0 unit of IR and evaporates,taking up 0 units more in the process do please explain how adjoining molecules can nonetheless be MORE excited.