<DIV>dear all,</DIV> <DIV> I calcultated the Raman tensor using the pwscf version 3.0. The scf part run correctly. But the the running of the ph.x will stop unexpectedly. The fowllowing part is the ph.out.</DIV> <DIV> </DIV> <DIV> Program PHONON v.3.0 starts ...<BR> Today is 26Mar2006 at 0:46:20 </DIV> <DIV> Ultrasoft (Vanderbilt) Pseudopotentials</DIV> <DIV> Reading file SnO.save ... only dimensions<BR> read complete</DIV> <DIV> Reading file SnO.save ... all except wavefuctions<BR> read complete</DIV> <DIV> nbndx = 10 nbnd = 10 natomwfc = 64 npwx
= 9600<BR> nelec = 20.00 nkb = 52 ngl = 4494<BR> WRITING PATTERNS TO FILE drho.pat</DIV> <DIV> phonons of SnO at Gamma </DIV> <DIV> ........................</DIV> <DIV> .........................</DIV>
<DIV> ........................</DIV> <DIV> Dielectric constant from finite-differences</DIV> <DIV> ( 9.668658880 0.000000000 0.000000000 )<BR> ( 0.000000000 9.668658880 0.000000000 )<BR> ( 0.000000000 0.000000000 6.794783712 )</DIV> <DIV> Electro-optic tensor is defined as
<BR> the derivative of the dielectric tensor <BR> with respect to one electric field <BR> units are Rydberg a.u. </DIV> <DIV> to obtain the static chi^2 multiply by 1/2 </DIV> <DIV> to convert to pm/Volt multiply per 2.7502 </DIV> <DIV><BR> Electro-optic tensor in cartesian axis: </DIV> <DIV> ( 0.000000000 0.000000000 0.000000000 )<BR>
( 0.000000000 0.000000000 0.000000000 )<BR> ( 0.000000000 0.000000000 0.000000000 )</DIV> <DIV> ( 0.000000000 0.000000000 0.000000000 )<BR> ( 0.000000000 0.000000000 0.000000000 )<BR> ( 0.000000000 0.000000000 0.000000000 )</DIV>
<DIV> ( 0.000000000 0.000000000 0.000000000 )<BR> ( 0.000000000 0.000000000 0.000000000 )<BR> ( 0.000000000 0.000000000 0.000000000 )</DIV> <DIV><BR> Computing Second order response </DIV> <DIV><BR> iter # 1 av.it.: 13.9<BR> thresh= 0.100E-01 alpha_mix = 0.700 |ddv_scf|^2 = 0.476E-02 "</DIV> <DIV> </DIV> <DIV>It stopped here without any error warning.</DIV> <DIV>So I
the change parameters such as tr2_ph, kpoints and ecut to the lower limitition. It run correctly. But "Electro-optic tensor in cartesian axis" is the same as above. So please help me with this.</DIV> <DIV> <BR>ps: the phonon frequencies at Gama point can be calculated freely.</DIV><p>
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