In a spectroscopy experiment, it’s important to know which transitions are allow
ID: 911139 • Letter: I
Question
In a spectroscopy experiment, it’s important to know which transitions are allowed or forbidden, to assess if the measured spectra are consistent with expectations. For the following transitions, which are allowed, which are forbidden, and if the latter, could you please explain why? If you could provide a good explanation for one forbidden and one allowed it would be great because I am lost right now. Thank you!
a.) H (1s2S1/2)->H (2p2P1/2)
b.) H (1s2S1/2)->H (3d2D3/2)
c.) H (1s2S1/2)->H (3p2P3/2)
d.) He (1s1S0)->He (2p3P1)
e.) Ar (3p1S0)->Ar (4s1P0)
f.) Ar (3p1S0)->Ar (4p1P0)
g.)Na (3s2S1/2)->Na(3p2P1/2)
Explanation / Answer
We know that in a centrosymmetric environment, transitions between like atomic orbitals such as s-s,p-p, d-d, or f-f, transitions are forbidden. this is as per laporte rule
a) Allowed (s to p)
b) Allowed (s to d)
c) Allowed (s to p)
d) allowed (s to p)
e) allowed (p to s)
f) forbidded (p to p)
g) allowed (s to p)