- #1
tomdodd4598
- 138
- 13
Hi,
I have learned about how to find the 4 spin states of 2 spin 1/2 particles, and how to find them by using the lowering operator twice on |1/2, 1/2> to find the triplet, then simply finding the orthogonal singlet state, |0, 0>.
I started to attempt finding the states of 3 spin 1/2 particles, and realize that there are 6:
|3/2, 3/2>, |3/2, 1/2>, |3/2, -1/2>, |3/2, -3/2>, |1/2, 1/2> and |1/2, -1/2>
I have found the first 4, by using the lowering operator three times on |3/2, 3/2>, to obtain the following:
|3/2, 3/2> = |uuu>
|3/2, 1/2> = 1/√3 (|uud> + |udu> + |duu>)
|3/2, -1/2> = 1/√3 (|udd> + |dud> + |ddu>)
|3/2, -3/2> = |ddd>
My problem is that I can't find the other two - there seem to be many possible orthogonal states, such as:
|1/2, 1/2> = 1/√2 (|uud> - |duu>) or 1/√2 (|uud> - |udu>) or 1/2√2 (2|uud> - |udu> - |duu>)
|1/2, -1/2> = 1/√2 (|udd> - |ddu>) or 1/√2 (|udd> - |dud>) or 1/2√2 (2|udd> - |dud> - |ddu>)
The question is really just the following - if they exist, what are the correct states for |1/2, 1/2> and |1/2, -1/2>?
Thanks in advance for any help,
Tom
I have learned about how to find the 4 spin states of 2 spin 1/2 particles, and how to find them by using the lowering operator twice on |1/2, 1/2> to find the triplet, then simply finding the orthogonal singlet state, |0, 0>.
I started to attempt finding the states of 3 spin 1/2 particles, and realize that there are 6:
|3/2, 3/2>, |3/2, 1/2>, |3/2, -1/2>, |3/2, -3/2>, |1/2, 1/2> and |1/2, -1/2>
I have found the first 4, by using the lowering operator three times on |3/2, 3/2>, to obtain the following:
|3/2, 3/2> = |uuu>
|3/2, 1/2> = 1/√3 (|uud> + |udu> + |duu>)
|3/2, -1/2> = 1/√3 (|udd> + |dud> + |ddu>)
|3/2, -3/2> = |ddd>
My problem is that I can't find the other two - there seem to be many possible orthogonal states, such as:
|1/2, 1/2> = 1/√2 (|uud> - |duu>) or 1/√2 (|uud> - |udu>) or 1/2√2 (2|uud> - |udu> - |duu>)
|1/2, -1/2> = 1/√2 (|udd> - |ddu>) or 1/√2 (|udd> - |dud>) or 1/2√2 (2|udd> - |dud> - |ddu>)
The question is really just the following - if they exist, what are the correct states for |1/2, 1/2> and |1/2, -1/2>?
Thanks in advance for any help,
Tom