I'm guessing that you are using the equation (See the bottom equation below.) This assumes you are measuring the spectrum of transitions from the ground state.
That means you have the second equation (below, next to the graph). The graph of this will look something like this. (See the graph.)
Notice that we really don't have a y-intercept since that would correspond to n --> infinity. But we can certainly approximate it graphically. Mathematically the intercept will be equal to 2(pi)R according to equation 2.
What is the name of the molecule CH2O
Last edited by topsquark; Dec 12th 2016 at 02:59 PM.