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the representation for tetrahedral symmetry should be
¦£ = A1(¦Í1) + E(¦Í2) + F2(¦Í3) + F2(¦Í4)                                                                         ( 1 )                                                                                   
  the F2(¦Í3, ¦Í4) modes are IR active, the F2(¦Í3) vibration is the antisymmetric stretch while the F2(¦Í4) is a bending mode [23].
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