Re: Re: [SIESTA-L] Any comments on the MeshCutoff

2012-11-21 Por tôpico 毛飞
> 主题: Re: [SIESTA-L] Any comments on the MeshCutoff > > > The way to converge it is just by making it larger and larger until > the property you are interested in is converged within the tolerance you > need. > > I want to comment that Etot vs Ecutoff is converging ve

Re: [SIESTA-L] Any comments on the MeshCutoff

2012-11-21 Por tôpico Oleksandr Voznyy
> The way to converge it is just by making it larger and larger until the property you are interested in is converged within the tolerance you need. I want to comment that Etot vs Ecutoff is converging very slowly, and looking at that curve one might want to go as high as 800Ry. On practice pe

Re: [SIESTA-L] Any comments on the MeshCutoff

2012-11-21 Por tôpico Emilio Artacho
Hi Fei The mesh cutoff controls the accuracy in the calculation of some integrals in real space. It is no a variational parameter in the sense that more accurate does not mean lower energy. The way to converge it is just by making it larger and larger until the property you are interested in is co

[SIESTA-L] Any comments on the MeshCutoff

2012-11-21 Por tôpico 毛飞
Hi, all I have question about the variable MeshCutoff used in Siesta. I know if I increase the MeshCutoff higher, the results will be more accurate. I am doing a geometry optimization of a given system, sometimes the total energy increase a little (about 0.2 ~ 0.3 eV) when I increase the