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<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Dear Gosia,</blockquote>
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<div>          What's your meaning of "calculate some "grid" of phonons and use q2r and matdyn"? I can not understand it quite clearly. Would you explain it more explicitly?</div>
<div>How to apply the acoustic sum rule in the el-ph calculation? Is it suitable for acoustic phonons?  </div><br> </div><br>                                                                                                                        gao