Optical absorption spectra

[madhu_menon2]

Hi Everyone,
I want to calculate the optical absorption spectra using VASP 5.4. I want to do this in a narrow energy range. How do I set Emin and Emax for this? Thanks in advance.

[henrique_miranda]

To choose the max energy range where the optical absorption spectrum is computed (LOPTICS=.TRUE.) you should use:
wiki/index.php/OMEGAMAX

Let me know if this answers your question.

[madhu_menon2]

Dear henrique_miranda,
Since I am trying to create a plot for absorption vs. energy, I want to specify an energy range along the x-axis. I am wondering if I can choose this in the input file. Thanks.

[henrique_miranda]

I believe currently you can only choose the higher limit using OMEGAMAX, the lower limit is always 0.
You can increase the number of points using the NEDOS variable.

[madhu_menon2]

OK. Thanks.