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["sun jason" <jasonsun98@hotmail.com>]

hi,

there is no singularity in the dynamical matrix whenever the system is a 
metal, so the raman tensor of metal can not be calculated. 

Best regards,
===============================================
Jian SUN 
Physics Dept. of Nanjing University 
National Lab. of Solid State Microstructures 
22 Hankou Road, Gulou District 
Nanjing, Jiangsu Province 
210093 
China 
===============================================





> From: lfe11@yahoo.com.tw
> Reply-To: forum@abinit.org
> To: forum@abinit.org
> Subject: [abinit-forum] about the Raman tensor of matel
> Date: Sun, 19 Feb 2006 09:16:15 +0100
>
> Dear all:
>
> I tried to calculate the Raman tensor of siliver bulk.
> I got an error inthe log file,showed below
>
> chkinp : ERROR -
> The value of occopt is found to be 4
> This is not allowed in a non-linear response calculation.
> Action : put occopt = 1 in your input file
>
> But siliver bulk is metallic, the value of occopt should be 3~7.
> Dose it mean that I can't cacilation the Raman tensor of metal?
>
> Thanks for your help.
>
>                                              Henry Chen