T=S I=Se 「=S SL=5.+ 1-Sr1-S.Se S-SSe”+SSSe 1-s,s.eZ G 1 = S11 2q 2 11 j S e - G = q q q q q 2 11 22 2 12 21 11 2 22 2 11 11 2 22 11 2 12 21 11 11 22 2 12 21 2 11 1 1 1 j j j j j in S S e S S S e S S S e S S e S S S e S S S S S - - - - - - - + = - = + - G G G = +