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A hydrogen atom is subjected to a magnetic field Bstrong enough to completely overwhelm the spin-orbit coupling. Into how many levels would the 2p level split, and what would be the spacing between them?

Short Answer

Expert verified

5 levels,

And energy difference is∆E=ehB2m

Step by step solution

01

total energy of magnetic field

In the case of a strong magnetic field Bsuch as this one, the total energy Eis given by

E=ehB2m(ml+ms)+Eo...................(1)

where Eois the zero-field energydata-custom-editor="chemistry" (B=0).

02

find level splits

The possible values for ml arel=1

ml=-1,0,1.............2

Since ms can have values of ±12, we conclude that the 2p level splits into 3+2=5 levels, since there are 3 possible values for ml and 2 possible values for ms.

The quantityml+2ms can have values of

role="math" localid="1658468430759" ml+2ms=-2,-1,0,1,2............3

For example, let us take the following two levels:ml+2ms=1 and ml+2ms=2.

03

energy difference ∆E

The energy difference∆E is then (we use Eq. (l))

∆E=ehB2m2-1∆E=ehB2m

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