<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Hello everyone</DIV>
<DIV>i am trying to obtain the LO modes for an ionic crystal. All the irreducible reresentations at the Gamma point are 1-dimensional (A & B). There are plenty of infra-red active modes (B_u), so when i use dynmat.x with a given direction, i have plenty of LO modes which should be assigned to the TO's. </DIV>
<DIV>I want to know that what should i do to assign the LO's to the TO's? Does the overlap matrix (with elements equal to the projection of the eigenvectors of LO's on the TO's) works?</DIV>
<DIV>Thanx for any comment</DIV>
<DIV> </DIV>
<DIV>R. Ebraahimi</DIV>
<DIV>Graduate Student</DIV>
<DIV>Tehran University</DIV></div><br>
</body></html>