The IR and vibrational modes of 4-hydroxybenzoic acid and 4-acetoxybenzoic acid are shown as an example of an interpreted spectrum using a non-Java interactive JSmol display (HTML5/JavaScript)

grid on grid off Load spectrum 1 spectrum 2 Overlay spectrum 1 and 2
show peak list show info hide info

Java2Script written by Zhou Renjian, et al. Jzlib written by Atsuhiko Yamanaka.
Jmol/JSpecView code conversion to JavaScript by Bob Hanson.

Initially based on code from 26th October 2013