<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div dir="ltr" data-setdir="false">dear all,</div><div dir="ltr" data-setdir="false">i am a novice in dft simulation and started using quantum espresso for about 3 months, i am stuck with the problem of phonon calculation . i need to calculate zero point energy for adsorbed species but the thing is the literature states to perform normal mode calculation and qe has two kind phono calculation gamma and q point based so i dont get the idea what is normal mode <br></div><div dir="ltr" data-setdir="false">please do help <br></div><div dir="ltr" data-setdir="false">Thanks in advance <br></div><div dir="ltr" data-setdir="false">Naval kishor <br></div><div dir="ltr" data-setdir="false"><br></div></div></body></html>