<html><head><style id="axi-htmleditor-style" type="text/css">p { margin: 0px; }</style></head><body dir="" style="font-size: 10pt; font-family: "Source Sans Pro", sans-serif; background-image: none; background-repeat: repeat; background-attachment: fixed;"><br><div><div><div style="font-family: 'Source Sans Pro', sans-serif; font-size: 10pt;"><div><div><div style="font-family: 'Source Sans Pro', sans-serif; font-size: 10pt;">Dear QS users,<br> I tried to do constraint geometry optimization by fixing the distance between one carbon of ethylene and one carbon of graphene with double vacancy. I attached my input file to this message. The job was done, but the distance changed from initial value of 3.325 to final value of 1.76 A . Please let me know waht is the problem. <br>Thank you in advance,<br>Parisa Alamdari,</div><div style="font-family: 'Source Sans Pro', sans-serif; font-size: 10pt;">PhD Student,<br></div><div style="font-family: 'Source Sans Pro', sans-serif; font-size: 10pt;">AUT, Iran<br></div></div></div></div></div></div></body></html><pre>
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