deletions | additions       diff --git a/The_distance_the_electron_travels__.tex b/The_distance_the_electron_travels__.tex  index 33b78c1..939a1f1 100644  --- a/The_distance_the_electron_travels__.tex  +++ b/The_distance_the_electron_travels__.tex 
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$$E_n=n(E_a+\delta_n) \text{ where } \delta_n=n\frac{n}{L}E_a$$.   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 (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 (Fig. \ref{fig:ArgonEnergyLevels}).     More stuff to discuss...  \begin{itemize}  %\item mean free path + equations   \item energy levels for neon and argon   \end{itemize}