Magnetic moment of singly ionized helium

[Emspak]

Homework Statement

Find the magnetic moment of singly ionized helium in terms of Bohr Magneton

I know the expression for the Bohr Magneton -- I am not trying to get a walk-through here as I want to do this myself, but I just want to know if I am correct in assuming that to get the problem going I use the Bohr radius expression, but with Z=2 and e = 1 (since we have one electron and two protons).

Plugging in the Bohr radius to the expression for angular momentum (L= 2\pi \nu r^2 after that.

Mostly I wasn't sure if I should assume its the magnetic moment of the nucleus or the electron around it...

 

[Simon Bridge]

A helium nucleus is an alpha particle - you can look up it's magnetic moment to answer your question :)

Note: http://en.wikipedia.org/wiki/Magnetic_moment#Magnetic_moment_of_an_atom
But it depends on where you are expected to start from.

 

[Emspak]

that's just it -- it isn't entirely clear from the question whether we're supposed to work from the spins or fro mthe shell model, or derive the whole thing. I was going to derive it and try to go from there.

 

[Simon Bridge]

Well what does the coursework do?

 

[Emspak]

well, so far he hasn't gone into the equations using Lande g-factor yet, or any of that. So I suspect that I should do the following:

-calculate the radius of single electron orbit around He nucleus using Bohr model
- plug that into the expressions for magnetic moment, working basically classically
- see how that compares to bohr magneton

Does that sound reasonable?