SCHM012
posted by David .
diagram all possible pathways for deexciting from n=4 to n=1

"deexciting"??

We can't draw diagrams on this forum but
n = 4 to n = 1
n = 4 to n = 2
n = 4 to n = 3
n = 3 to n = 2
n = 3 to n = 1
n = 2 to n = 1
Do you see any others?