[ \frac1\lambda = RZ^2 \left( \frac1n_1^2 - \frac1n_2^2 \right) ]
[ E_J = B J(J+1) ]
I notice that the keyword you provided β β appears to reference a specific textbook (likely by an author named Rajkumar), a possible PDF version, and a page or chapter number ("56").
where ( h ) is Planckβs constant, ( \nu ) frequency, ( c ) speed of light, and ( \lambda ) wavelength. The result is a line spectrum β unique to each element.
[ E = E_\textelectronic + E_\textvibrational + E_\textrotational ]