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Hello,
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<div>I am trying to calculate electron-phonon interaction coefficients using the optimized tetrahedron method in qe7.0.</div>
<div>I tried running the example at PHonon/examples/tetra_example/.</div>
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<div>In the output of alpha2f.x, I get NaN for omega_ln and 0 for lambda (see below).</div>
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<div>```</div>
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<div> Program ALPHA2F v.7.0 starts on 28Apr2022 at 13:56:55</div>
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<div> This program is part of the open-source Quantum ESPRESSO suite</div>
<div> for quantum simulation of materials; please cite</div>
<div> "P. Giannozzi et al., J. Phys.:Condens. Matter 21 395502 (2009);</div>
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<div> Writing a2F to a file aluminum.a2F.dat</div>
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<div> Compute lambda and omega_ln from a2F to verify it.</div>
<div> lambda : 0.000000000000000E+000</div>
<div> omega_ln [Ry] : NaN</div>
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<div> Compute lambda and omega_ln directly from omega_q and lambda_q</div>
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<div> lambda : 0.334000000000000</div>
<div> omega_ln [Ryd] : 2.408181004917099E-003</div>
<div> omega_ln [THz] : 7.92253491785528</div>
<div> omega_ln [K] : 380.221708280190</div>
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<div> For plotting T_c from the McMillan formula, please type</div>
<div> $ gnuplot aluminum.McMillan.gp</div>
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<div> ALPHA2F : 0.20s CPU 0.32s WALL</div>
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<div> This run was terminated on: 13:56:55 28Apr2022</div>
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<div>=------------------------------------------------------------------------------=</div>
<div> JOB DONE.</div>
<div>=------------------------------------------------------------------------------=</div>
<div>```</div>
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<div class="elementToProof">The frequency column of 'a2f.dat' file looks good but the a2f column just has zeros in it.<br>
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I am not sure what is wrong.</div>
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I didn't see any warning in the output of self-consistent and phonon calculation.
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I used the intel compiler (2019.1.144 version) and openmpi(4.0.3) to compile qe-7.0.<br>
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<p style="margin-top:0px; margin-bottom:0px; margin-top:0; margin-bottom:0"><span style="font-size:11pt">Regards,</span></p>
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<div><b><span style="font-size:11pt">Ajinkya Hire</span></b></div>
<div><b><span style="font-size:11pt">Graduate Student</span></b><br>
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<div class="elementToProof"><span style="font-size:11pt"><b><span style="font-size:11pt">University of Florida</span></b></span></div>
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