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adf:ir2020 [2020/11/16 20:41] – 创建 liu.jun | adf:ir2020 [2024/05/29 17:03] (当前版本) – [气相分子的频率、红外IR、零点能、转动能量、转动惯量、熵、焓、热容与Gibbs自由能、液相自由能与焓的计算] liu.jun | ||
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- | ====== 分子的频率、红外、零点能、转动能量、转动惯量、熵、焓、热熔与Gibbs自由能====== | + | ====== |
=====第一步,优化分子结构===== | =====第一步,优化分子结构===== | ||
行 22: | 行 22: | ||
在该任何相关的任何窗口,或在ADFjobs中选中该任务之后,点击ADF LOGO > Spectra,即显示振动频率: | 在该任何相关的任何窗口,或在ADFjobs中选中该任务之后,点击ADF LOGO > Spectra,即显示振动频率: | ||
- | {{ :adf:frequencies03.png?650 }} | + | {{ :adf:2020frequencies03.png?650 }} |
- | 如果有虚频,则虚频的峰为负数,此例中没有虚频。点击峰的位置,或者下方列表中计算得到的三个峰的三行,则显示该峰对应的振动模式的振动动画。 | + | 如果有虚频,则虚频的峰为负数,此例中没有虚频。 |
- | 点击SCM > Output > Other Properties > Zero-Point Energy可以看到零点能。 | + | <color green> |
- | + | ====零点能==== | |
- | 在ADF logo > Output | + | 点击SCM > Output > 窗口底部搜索“Zero-point energy”可以看到零点能: |
+ | < | ||
+ | Zero-point energy (Hartree): | ||
+ | </code> | ||
+ | Bonding Energy加上零点能即考虑了零点能矫正。 | ||
+ | ====转动惯量==== | ||
+ | Output窗口底部搜索“Moments of Inertia”,显示转动惯量的数值,及其主轴: | ||
< | < | ||
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- | Nr. of T-steps: | ||
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- | 1.9638 4.4225 6.3862 | + | 52.0223 194.1243 223.1396 |
| | ||
- | 0.0000 | + | 0.8412 -0.5322 -0.0958 |
- | 1.0000 | + | 0.0781 -0.0558 0.9954 |
- | 0.0000 1.0000 0.0000 | + | 0.5350 0.8448 0.0054 |
+ | </ | ||
+ | ====熵、焓、热熔与Gibbs自由能==== | ||
- | The rotational contribution to the molecular entropy includes | + | 在SCM > Output >Other properties > Statistical Thermal Analysis,可以看到文本形式的输出内容,包括强度和热力学信息: |
- | a term, dependent on the symmetry number sigma. The results | + | < |
- | reported below were computed using sigma = 2, determined from | + | Temp Transl |
- | the point group symmetry of the input geometry (C(2V)). | + | ---- ------ |
- | If this is not the correct symmetry, try symmetrizing the molecule before | + | |
- | | + | |
- | of the Cartesian axes). | + | |
- | | + | |
- | the vibrational sums. Their contributions, | + | |
+ | | ||
+ | Nuclear Internal Energy (kcal/ | ||
+ | Constant Volume Heat Capacity (cal/ | ||
+ | (c) Constant Volume Heat Capacity (cal/ | ||
- | | + | |
- | | + | |
- | + | ||
- | | + | |
- | Internal Energy (Kcal/ | + | |
- | Constant Volume Heat Capacity (cal/ | + | |
- | + | ||
- | | + | |
| | ||
-------------------- | -------------------- | ||
- | Bond Energy: | + | |
- | Internal Energy: | + | |
- | pV/n = RT: | + | (c) Nuclear |
- | Enthalpy H: | + | |
- | -T*S: | + | pV/n = RT: |
- | Gibbs free energy: | + | Enthalpy H: |
- | + | -T*S: | |
- | + | (c) -T*S: | |
- | | + | Gibbs free energy: |
- | | + | |
- | + | ||
- | | + | |
- | | + | |
- | Constant Volume Heat Capacity (cal/ | + | |
- | + | ||
- | Summary of energy terms | + | |
- | | + | |
- | -------------------- | + | |
- | Bond Energy: | + | |
- | | + | |
- | | + | |
- | Enthalpy H: | + | |
- | -T*S: | + | |
- | Gibbs free energy: | + | |
- | + | ||
- | + | ||
- | ………… | + | |
- | + | ||
- | ………… | + | |
- | + | ||
- | + | ||
- | + | ||
- | | + | |
- | | + | |
- | + | ||
- | | + | |
- | Internal Energy (Kcal/ | + | |
- | Constant Volume Heat Capacity (cal/ | + | |
- | + | ||
- | Summary of energy terms | + | |
- | | + | |
- | -------------------- | + | |
- | Bond Energy: | + | |
- | Internal Energy: | + | |
- | pV/n = RT: | + | |
- | Enthalpy H: | + | |
- | | + | |
- | Gibbs free energy: | + | |
</ | </ | ||
其中, | 其中, | ||
* 如同输出文件内容所说,这种计算Gibbs自由能的方式,引入了理想气体近似, | * 如同输出文件内容所说,这种计算Gibbs自由能的方式,引入了理想气体近似, | ||
- | * Moments of Inertia,转动惯量I。转动能级E< | + | * Transl,Rotat,Vibrat,Total三项列出了各个温度时,熵、核内能、热容的平移、转动、振动分量与总和。 |
- | * Transl,Rotat,Vibrat,Total三项列出了各个温度时,熵、内能、热容的平移、转动、振动分量与总和。 | + | * 转动能级的计算:Moments of Inertia,转动惯量I,在前面有列出。转动能级E< |
- | * Summary of energy terms,列出了内能、焓、Gibbs自由能等信息。 | + | * Summary of energy terms,列出了电子内能(即Energy from Engine)、焓、Gibbs自由能等信息。 |
+ | * (c)是进行了低频热力学修正之后的值,参考:https:// | ||
+ | * 这里的自由能是气相的自由能,**液体自由能的计算**,参考:[[adf: | ||
+ | |||
+ | =====补充:只计算部分原子相关的振动、Gibbs自由能等,如何设置?===== | ||
+ | ====设置==== | ||
+ | 其他设置如上文所示,增加设置如下: | ||
+ | * 将需要计算振动的这部分原子设置为一个Region(设置方法参考:[[adf: | ||
+ | * Properties → IR(Frequency), | ||
+ | |||
+ | ====结果==== | ||
+ | * 平动、转动相关的能量,全部原子考虑在内 | ||
+ | * 振动相关能量,仅仅考虑了指定这部分原子振动引起的 |