<div>Dear all user:</div> <div>i have calculated the phonon of PbTiO3, and i have obtained eignvector of atom under each mode.</div> <div>for example:</div> <div> omega( 1) = -4.221301 [THz] = -140.808368 [cm-1]<BR> ( -0.092855 0.000000 -0.004178 0.000000 0.001020 0.000000 )<BR> ( -0.185613 0.000000 -0.008352 0.000000 0.002040 0.000000 )<BR> ( 0.598322 0.000000 0.026924 0.000000 -0.005371 0.000000 )<BR> ( 0.598322 0.000000 0.021990 0.000000 -0.006576 0.000000 )<BR> ( 0.488678 0.000000 0.026924 0.000000 -0.006576 0.000000 )<BR> now i have kown the eigndisplacement |u> = M^(-1/2) | v>.</div> <div>but i am confused with mass M. for example, for Pb atom in PbTiO3. how much is mass of Pb in equation above?</div>
<div>please grive me some construction!</div> <div> </div> <div>Regards</div> <div> </div> <div> zhuzhenye </div><p>
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