In contrast , a doublet state contains one unpaired electron .
In contrast , a doublet state shows splitting of spectral lines into a doublet ; and a triplet state has two unpaired electrons and shows threefold splitting of spectral lines .
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 .