<html><head></head><body><div class="ydp730fce64yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div id="ydp730fce64yiv1362079554"><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;" class="ydp730fce64yiv1362079554yahoo-style-wrap"><div dir="ltr">Dear all ,</div><div dir="ltr">i am trying to protonate hydrogen on the adsorbed co2 and to form cooh and ocho and computing energy barrier for protonation using neb calculation but the barrier is turning out to be 0 ev but as we all know activation barrier cant be zero do suggest some solution <br></div><div dir="ltr">thanks in advance <br></div></div></div></div></div></body></html>