<div dir="ltr"><pre> Dear Arles V. Gil Rebaza,<br></pre><pre>What is the significance of cos60 and sin60. I don't know much.<br></pre><pre>Thanks in advance<br><br></pre><pre>Venkat<br></pre><pre>PhD student <br></pre><pre>IIT Bombay<br></pre><pre>Mumbai <br></pre><pre><br>Dear Venkataramana, if you have a FCC(111) surface, probabily you should
have these lattice vectors (is a option representation)
a 0 0
b*cos60 b*sin60 0
0 0 c+h
where a, b, and c are the distance that you are reporting, and "h" is the
vacuum to simulate a surface.
Best.
Arles V. Gil Rebaza
IFLP-Argentina</pre><br><br><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Sep 25, 2015 at 9:46 PM, Venkataramana Imandi <span dir="ltr"><<a href="mailto:venkataramana.imandi@gmail.com" target="_blank">venkataramana.imandi@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Dear all,<br><br>I generated cubic fcc(111) in the form of 3x2x2 type structure (6 layers and each layer has 12 atoms) with Iridium (lattice constant:3.839 angstroms).<br>In the generated coordinates file, crystal axes are 8.14374880, 9.40359112, 13.29868610 (generated coordinate are attached). Can i represent<br>CELL_PARAMETERS angstrom in addition to ibrav=0 in the system namelist as shown below (for whole Iridium structure).<br>8.14374880 0.00000000   0.000000000<br>0.00000000 9.40359112   0.000000000<br>0.00000000 0.00000000   13.29868610<br><br>Is the above representation correct (maintains cubic fcc), if not, please suggest me how to represent CELL_PARAMETERS for whole Iridium structure.<br>I am new user and please suggest me correct way of doing calculations.<br><br></div>Again, I want to keep manually methane molecule on the top of Iridium (on the top of z-axis, above 5 angstroms from the top atom in the z-axis), then the resultant whole structure maintain fcc cubic. Please give some suggestions. I am new to quantum espresso calculations. <br><div><br>     72     72     72     72<br>    8.14374880    9.40359112   13.29868610    0.00000000    0.00000000    0.00000000 MD time =  0.000E+00 ps<br>Ir          6.78645733         5.48542817         6.64934305<br>Ir          5.42916587         7.83632593         6.64934305<br>Ir          5.42916587         4.70179556         4.43289536<br>Ir          6.78645733         7.05269336         4.43289536<br>Ir          5.42916587         6.26906075         2.21644768<br>Ir          6.78645733         8.61995854         2.21644768<br>Ir          4.07187440         5.48542817         6.64934305<br>Ir          2.71458293         7.83632593         6.64934305<br>Ir          2.71458293         4.70179556         4.43289536<br>Ir          4.07187440         7.05269336         4.43289536<br>Ir          2.71458293         6.26906075         2.21644768<br>Ir          4.07187440         8.61995854         2.21644768<br>Ir          1.35729146         5.48542817         6.64934305<br>Ir          0.00000000         7.83632593         6.64934305<br>Ir          0.00000000         4.70179556         4.43289536<br>Ir          1.35729146         7.05269336         4.43289536<br>Ir          0.00000000         6.26906075         2.21644768<br>Ir          1.35729146         8.61995854         2.21644768<br>Ir          6.78645733         0.78363261         6.64934305<br>Ir          5.42916587         3.13453037         6.64934305<br>Ir          5.42916587         0.00000000         4.43289536<br>Ir          6.78645733         2.35089780         4.43289536<br>Ir          5.42916587         1.56726519         2.21644768<br>Ir          6.78645733         3.91816298         2.21644768<br>Ir          4.07187440         0.78363261         6.64934305<br>Ir          2.71458293         3.13453037         6.64934305<br>Ir          2.71458293         0.00000000         4.43289536<br>Ir          4.07187440         2.35089780         4.43289536<br>Ir          2.71458293         1.56726519         2.21644768<br>Ir          4.07187440         3.91816298         2.21644768<br>Ir          1.35729146         0.78363261         6.64934305<br>Ir          0.00000000         3.13453037         6.64934305<br>Ir          0.00000000         0.00000000         4.43289536<br>Ir          1.35729146         2.35089780         4.43289536<br>Ir          0.00000000         1.56726519         2.21644768<br>Ir          1.35729146         3.91816298         2.21644768<br>Ir          6.78645733         5.48542817         0.00000000<br>Ir          5.42916587         7.83632593         0.00000000<br>Ir          5.42916587         4.70179556        -2.21644769<br>Ir          6.78645733         7.05269336        -2.21644769<br>Ir          5.42916587         6.26906075        -4.43289537<br>Ir          6.78645733         8.61995854        -4.43289537<br>Ir          4.07187440         5.48542817         0.00000000<br>Ir          2.71458293         7.83632593         0.00000000<br>Ir          2.71458293         4.70179556        -2.21644769<br>Ir          4.07187440         7.05269336        -2.21644769<br>Ir          2.71458293         6.26906075        -4.43289537<br>Ir          4.07187440         8.61995854        -4.43289537<br>Ir          1.35729146         5.48542817         0.00000000<br>Ir          0.00000000         7.83632593         0.00000000<br>Ir          0.00000000         4.70179556        -2.21644769<br>Ir          1.35729146         7.05269336        -2.21644769<br>Ir          0.00000000         6.26906075        -4.43289537<br>Ir          1.35729146         8.61995854        -4.43289537<br>Ir          6.78645733         0.78363261         0.00000000<br>Ir          5.42916587         3.13453037         0.00000000<br>Ir          5.42916587         0.00000000        -2.21644769<br>Ir          6.78645733         2.35089780        -2.21644769<br>Ir          5.42916587         1.56726519        -4.43289537<br>Ir          6.78645733         3.91816298        -4.43289537<br>Ir          4.07187440         0.78363261         0.00000000<br>Ir          2.71458293         3.13453037         0.00000000<br>Ir          2.71458293         0.00000000        -2.21644769<br>Ir          4.07187440         2.35089780        -2.21644769<br>Ir          2.71458293         1.56726519        -4.43289537<br>Ir          4.07187440         3.91816298        -4.43289537<br>Ir          1.35729146         0.78363261         0.00000000<br>Ir          0.00000000         3.13453037         0.00000000<br>Ir          0.00000000         0.00000000        -2.21644769<br>Ir          1.35729146         2.35089780        -2.21644769<br>Ir          0.00000000         1.56726519        -4.43289537<br>Ir          1.35729146         3.91816298        -4.43289537<br><br></div><div>Venkat<br></div><div>PhD research scholar<br></div><div>IIT Bombay<br></div><div>Mumbai<br></div><div><br></div></div>
</blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature">venkataramana</div>
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