TODO
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1. [clear, 2020/07/31] wrap functions with atom as argument

2. [clear, 2020/08/07] atomic data format with configuration prefix

3. [clear, 2020/08/07] transition rate plot (total/radiative/collisional) with Grotrian diagram

4. inward/outward transition percentage respect to a specific level

5. SE : single Te and Ne --> Te, Tr, Ne (point)

  - radiative v.s. collisional

  - add equations to SE_Plots.ipynb

6. SE : with real solar spectrum (point)

7. Slab model (Ca II) --> calculate intensity profile of Ca II H/K, IR triplet

8. SE : with real solar spectrum (slab)

9. Radiative transfer (with spatial mesh) --> calculate intensity profile of Ca II H/K, IR triplet

10. S2 : Hydrogen model (Balmer series: alpha/beta/gamma)

Extra :

  1. Lienard-Wiechart potential

  2. [clear, 2020/08/07] wavelength in air

Issues :

  1. [clear, 2020/08/07] Detail Balanced does not hold under LTE?

  2. insignificant Collisional transition rate in Ca_II model?