Spin State


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Emily_Stenzler_2H
Posts: 181
Joined: Wed Sep 30, 2020 10:02 pm

Spin State

Postby Emily_Stenzler_2H » Sun Nov 15, 2020 5:29 pm

Does anyone know how the value 1/2 was determined to be used for spin state ( since spin state can only be +1/2 or -1/2)? Does this value have any significance ?

Sean Wang 1F
Posts: 85
Joined: Wed Sep 30, 2020 9:34 pm

Re: Spin State

Postby Sean Wang 1F » Sun Nov 15, 2020 5:43 pm

I'm not entirely sure but I looked it up online and it says that the value is 1/2 because because a particle needs to be fully rotated twice before having getting to the same initial configuration.

Taha 2D
Posts: 75
Joined: Wed Sep 30, 2020 9:50 pm

Re: Spin State

Postby Taha 2D » Sun Nov 15, 2020 5:47 pm

the way it was calculated is well beyond our scope but the experiment which found out about the number 1/2 is the Stern–Gerlach experiment(experiment with the deflected silver atoms discussed briefly in a lecture). Spin is known as intrinsic angular momentum and its not actually referring to particles spinning. All we need to know is that there are 2 states in which paired electrons can be in(the number itself isnt important right now). (fermions have 1/2 -1/2 spins not every particle)

Jaclyn Schwartz 1I
Posts: 94
Joined: Wed Sep 30, 2020 9:45 pm

Re: Spin State

Postby Jaclyn Schwartz 1I » Sun Nov 15, 2020 8:02 pm

I would assume because in an orbital there is 2 options of which way it "spins". So +1/2 and -1/2 is to differentiate between them

Jacob Schwarz-Discussion 3I
Posts: 81
Joined: Wed Sep 30, 2020 10:01 pm

Re: Spin State

Postby Jacob Schwarz-Discussion 3I » Sun Nov 15, 2020 11:50 pm

I don't think you will use it mathematically, but knowing how to find either the +1/2 or -1/2 spin state is important!

Edward Castro
Posts: 50
Joined: Wed Sep 30, 2020 9:32 pm

Re: Spin State

Postby Edward Castro » Sun Nov 15, 2020 11:52 pm

being able to identify the +1/-1 would be the best way to follow spin state

Chinmayi Mutyala 3H
Posts: 90
Joined: Wed Sep 30, 2020 9:50 pm

Re: Spin State

Postby Chinmayi Mutyala 3H » Mon Nov 16, 2020 12:45 am

I don't think we need to know about the specifics of how we got the value exactly; just that + means upward spin and - means downward spin.

jia207
Posts: 101
Joined: Wed Sep 30, 2020 9:52 pm

Re: Spin State

Postby jia207 » Sun Nov 22, 2020 11:04 pm

Knowing the spin state differentiates the atom from another atom. No two atoms are allowed to have the same configuration which is why this is important.

205323697
Posts: 50
Joined: Tue Feb 25, 2020 12:15 am

Re: Spin State

Postby 205323697 » Thu Dec 17, 2020 9:19 am

Just to clarify, when we do the spin state we have to first fill out all of the orbitals before putting two states together, right?


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