deletions | additions       diff --git a/The_distance_the_electron_travels__.tex b/The_distance_the_electron_travels__.tex  index 2d06d5d..0f30e27 100644  --- a/The_distance_the_electron_travels__.tex  +++ b/The_distance_the_electron_travels__.tex 
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The two equations above can be used to derive an expression for the spacing between two minimas (refer to Appendix A). The expression $\Delta E(n)=[1+\frac{n}{L}(2n-1)]E_a$ shows that the spacing between two anode voltage minima is increasing.   In this lab, Ne atoms have only been excited to the first and second energy level; whereas, Ar atoms mainly stay in the first energy level. According to the NIST Atomic Spectra Database, the first excitation energy of Ne I is 16.62eV, and the second excitation energy level is 18.38eV. 18.38eV (as shown in Fig. \ref{fig:NeonEnergyLevels}).  For Ar I, the four sub levels within the first energy level are 11.55eV, 11.62eV, 11.72eV and 11.83eV respectively.   More stuff to discuss...  \begin{itemize}