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identation

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[交流] 【求助】ABINIT如何计算红外、拉曼光谱? 已有2人参与

ABINIT如何计算红外和拉曼光谱呢?具体计算方法是什么呢?请教高手!
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mywtfmp3

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小木虫: 金币+0.5, 给个红包,谢谢回帖
居然还是师兄做过的。。
10楼2012-09-18 12:00:00
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zxzj05

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★ ★ ★ ★ ★ ★
identation(金币+2):谢谢参与
aylayl08(金币+5):very good 。thank you 2010-03-19 18:43
identation(金币+10): 2010-03-19 23:50
identation(金币+8):谢谢,红外光谱的输入文件在abinit说明的哪里呢?可否提示一下,嘿嘿 2010-03-25 23:28
aylayl08(1ST强帖+1):回答很强 2010-03-27 18:39
See Tv4#t56 and t57

e.g.#t56
#Compute GaAs crystal : ground-state with few bands,
#then large number of bands, then ddk for different directions
#

ndtset 5

#First dataset : SC run with 2 kpoints
prtden1 1     getden1 0   getwfk1 0
nband1  4     nstep1 30


#Second dataset : NSC run with 32 kpoints, lots of bands
iscf2 -2  getwfk2 1   getden2 1
nband2  50

# ddk response function
   iscf3 -3
   nqpt3  1
    qpt3  0.0d0 0.0d0 0.0d0
  rfdir3  1 0 0
rfelfd3  2
getwfk3  2
  nband3  50

# ddk response function
   iscf4 -3
   nqpt4  1
    qpt4  0.0d0 0.0d0 0.0d0
  rfdir4  0 1 0
rfelfd4  2
getwfk4  2
  nband4  50


# ddk response function
   iscf5 -3
   nqpt5  1
    qpt5  0.0d0 0.0d0 0.0d0
  rfdir5  0 0 1
rfelfd5  2
getwfk5  2
  nband5  50


#Common data
nshiftk 4
shiftk  0.5 0.5 0.5
         0.5 0.0 0.0
         0.0 0.5 0.0
         0.0 0.0 0.5
ngkpt 2 2 2
kptopt 1     # Is this correct for preparation of optic ??

acell   3*10.60
amu 69.72  74.9216
diemac 10.0
ecut 4.00
iscf 3
ixc 3
natom  2 nband 4  nbdbuf 0
nstep 15
ntypat  2
rprim   0 .5 .5  .5 0 .5  .5 .5 0
xred 3*0.00d0 3*0.25d0
tnons 72*0.0
typat  1 2  tolwfr  1.e-22
znucl  31 33

t57

t56o_DS3_1WF7
t56o_DS4_1WF8
t56o_DS5_1WF9
t56o_DS2_WFK
0.001         ! Value of the smearing factor, in Hartree
0.010   1     ! Difference between frequency values (in Hartree), and maximum frequency ( 1 Ha is about 27.211 eV)
0.000         ! Scissor shift if needed, in Hartree
0.001         ! Tolerance on closeness of singularities (in Hartree)
3             ! Number of components of linear optic tensor to be computed
11 33 23      ! Linear coefficients to be computed (x=1, y=2, z=3)
2             ! Number of components of nonlinear optic tensor to be computed
123 222       ! Non-linear coefficients to be computed




参考文献:
"static" non-linear capabilities of ABINIT are used (Raman efficiencies, electro-optic coefficients ... ), the following paper should be mentioned :
[11] M. Veithen, X. Gonze, and Ph. Ghosez, Phys. Rev. B 71, 125107 (2005) "Nonlinear optical susceptibilities, Raman efficiencies, and electrooptic tensors from firstprinciples density functional theory ".

http://www.abinit.org/about/acknowledgments#11

V_2O_5拉曼光谱的第一性原理计算--《兰州大学》2009年博士论文

http://www.science24.com/paper/16305 (Ab initio calculation of the Raman spectrum of Li2SrTa2O7 using generalized forces and symmetry coordinates)

http://www3.interscience.wiley.c ... ETRY=1&SRETRY=0 (Raman spectrum of vanadium pentoxide from density-functional perturbation theory)



NOTE:

optdriver=5 allows to compute
non-resonant Raman scattering - being non-resonant, metals are excluded -,
and non-linear dielectric susceptibility at long-wavelength - being at long wavelength,
metals are excluded - .

For metals, frequency-dependent nlo should possible, in the simple sum-over-state
approximation, using the "optics" utility.
储氢家族欢迎储氢研究者!
2楼2010-03-19 18:39:18
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identation

金虫 (著名写手)

引用回帖:
Originally posted by zxzj05 at 2010-03-19 18:39:18:
See Tv4#t56 and t57

e.g.#t56
#Compute GaAs crystal : ground-state with few bands,
#then large number of bands, then ddk for different directions
#

ndtset 5

#First dataset : SC run with ...

谢谢提供资料!还想请教一下,ABINIT说明中红外光谱的算例在哪呢(tests文件中的哪个是红外光谱呢)?可否提供一下,感激不尽!
3楼2010-03-25 23:27:59
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zxzj05

荣誉版主 (著名写手)

红外光谱在abinit的计算我倒是没听过,你可以去查查,
如果有记得告诉我呀
储氢家族欢迎储氢研究者!
4楼2010-03-27 01:40:04
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