Singlet state
Special low-energy state in quantum mechanics
Singlet state
In quantum mechanics, a singlet state usually refers to a system in which all electrons are paired. The term "singlet" originally meant a linked set of particles whose net angular momentum is zero, that is, whose overall spin quantum number s = 0 {\displaystyle s=0} . As a result, there is only one spectral line of a singlet state. In contrast, a doublet state contains one unpaired electron and shows splitting of spectral lines into a doublet, and a triplet state has two unpaired electrons and shows threefold splitting of spectral lines.
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