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wu砰然心动

银虫 (小有名气)

[求助] 请教MS软件大神 已有1人参与

图中划线的两个选项有什么区别啊。这是在MS中固定原子时弹出的对话框。

请教MS软件大神
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Liffighting

木虫 (初入文坛)

一个笛卡尔坐标,一个分数坐标

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2楼2017-03-21 08:25:22
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月只蓝

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【答案】应助回帖

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wu砰然心动: 金币+6, ★★★★★最佳答案 2017-03-25 15:39:41
In lattices, atom positions may be described using two different coordinate systems, Cartesian or fractional.

Cartesian coordinates are defined in the usual way using 3 orthogonal unit vectors i, j and k.

In Materials Studio, Cartesian coordinates are used to describe the positions of objects in nonperiodic structures and the absolute positions of objects in a lattice.

Fractional coordinates are used to describe the positions of objects in a lattice relative to the unit cell. For crystals they are defined in terms of the lattice vectors a, b and c. For surfaces they are defined in terms of u and v and a third vector w which is a unit vector normal to both u and v.

Fractional coordinates indicate where objects are in the unit cell. For example, in a crystal an atom lying at (0.5,0.5,0.5) in fractional coordinates will be directly in the middle of the unit cell.

In a surface an atom lying at (0.5,0.5,0.5) in fractional coordinates will be 0.5 Å from the surface plane directly above the middle of the unit cell. Likewise a second atom lying at (0.5,0.5,4.5) in fractional coordinates will be 4.5 Å from the surface plane directly above the middle of the unit cell, and will have no periodic relationship to the first.
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3楼2017-03-21 11:14:52
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wu砰然心动

银虫 (小有名气)

引用回帖:
2楼: Originally posted by Liffighting at 2017-03-21 08:25:22
一个笛卡尔坐标,一个分数坐标

这个我知道,就是具体在建模中会有什么效果。

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4楼2017-03-21 12:44:03
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wu砰然心动

银虫 (小有名气)

引用回帖:
3楼: Originally posted by 月只蓝 at 2017-03-21 11:14:52
In lattices, atom positions may be described using two different coordinate systems, Cartesian or fractional.

Cartesian coordinates are defined in the usual way using 3 orthogonal unit vectors i,  ...

懂了,谢谢回复

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5楼2017-03-21 12:47:38
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