1. The problem statement, all variables and given/known data So I'm stuck on part (ii) where we have to solve the rotational energy levels. Problem: http://screencast.com/t/9rZStJdG3wJ [Broken] The answer is ii) 0, 3.84 cm-1, 11.52 cm-1 2. Relevant equations Equations: http://screencast.com/t/ubFEheGBz [Broken] 3. The attempt at a solution Calculate the reduced mass then divide by avagardos number and x1000 to get it into kg per molecule - 1.139*10^-26 Then I use this value to work out I and get 1.457*10^-46 Then, B can be calculated I got 603.52 for this Next, D = 187.7 Put all this into the equation for E and I end up with 460.24 but the actual answer for this case (j=1) was 3.84cm^-1. Please let me know if theres anything I can clear up.