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Dear all users:

     I want to find the absorption spectrum of Ag2 cluster by abinit.I have 
some problem about my result.

     First,according to the paper(K.Yabana,physical review A,vol 60,3809,1999)
,the absorption peaks should be found at 3.0 ev and 4.7ev.But I can't find 
the absorption spectrum at low frequency in my outpur file.I refered to the 
file(~/Test_v3/t55.in).What should I do ?

     Second,if I change the variable ixc=1 to ixc=21,I can find the 
absorption spectrum at low frequency.But the result is so different from the 
result in the paper(K.Yabana,physical review A,vol 60,3809,1999).I used the 
pseudopotential-47ag.pspnc in my job,in the file,the variable pspxc is 
setting to 1.Can I use ixc=21 with the pseudopotential-47ag.pspnc?or what 
should I do?

     My input file is showed below.Thanks for your help.
                                                        Henry Chen
                                                       
===============================================================================
###TDDFT of Ag2 cluster system : Computation of excited states

 ndtset 2

#DATASET 1  SCF
 iscf1 5
 nband1 11
 prtden11
 tolwfr1 1.0d-15

#DATASET 2 TDDFT
 getden2 1
 tolwfr2 1.0d-9
 iscf2 -1
 getwfk2 1
 nband2 25

#Common
occopt 4
tsmear 0.04
acell 3*10.0
rprim 1.0 0.0 0.0
      0.0 1.0 0.0
      0.0 0.0 1.0 
kpt 3*0.0
nkpt 1
ngkpt 8 8 8
ecut 20.0
ixc 21

localrdwf 1
natom 2 
ntypat 1
typat 2*1

nstep 25
toldfe 1.0d-6
xcart 2.499286396 5.0 5.0
      7.500713605 5.0 5.0
znucl 47