Ciro Santilli
🔗

# Hydrogen emission spectrum

🔗
🔗
One reasonable and memorable approximation excluding any fine structure is: $$En​=−n213.6eV​ (20)$$
🔗
This gives for example from principal quantum number 1 to 2 a difference: $$En​=−13.6eV[221​−121​]=10.2eV (21)$$ which with Planck-Einstein relation gives about , which is a good match with the value of 121.567... from the NIST Atomic Spectra Database.
🔗
🔗

🔗