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adf:ir

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如何计算分子的频率、红外吸收谱、零点能

1,优化分子结构

2,导入优化好的坐标到ADFinput中:

打开优化任务的movie(在ADFjobs中选中该任务之后,点击SCM LOGO > movie;或在该优化任务的任何一个窗口点击SCM-movie),将最后一帧的收敛结构导出,可以用如下几种方式:

在movie窗口,点击file > save geometry,则将该结构保存为xyz坐标格式,在计算频率的ADFinput窗口导入坐标,并设置参数如下图

或在movie窗口,点击file > Update Geometry In Input,则将该帧坐标更新到ADFinput窗口中,将该窗口参数更改为频率计算的参数(如上图),然后另存为频率计算的任务名字。

3,保存、运行

4,结果查看

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:

如果有虚频,则虚频的峰为负数,并且峰朝上,此例中没有虚频,正常的振动峰朝下。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。

点击ADF LOGO > Output > Other Properties > Zero-Point Energy可以看到零点能。

在ADF logo > Output >Other properties > Intensities Collected,可以看到文本形式的输出内容,包括强度和热力学信息:

 List of All Frequencies:
 
 
 Intensities
 ===========
 
               Frequency       Dipole Strength        Absorption Intensity (degeneracy not counted)
                 cm-1           1e-40 esu2 cm2          km/mole
              ----------          ----------          ----------
             1477.873127          246.870556           91.450170
             3807.801217            6.023038            5.748677
             3958.433112          111.790825          110.919407
 
 
 
 
 Statistical Thermal Analysis  ***  ideal gas assumed  ***
 
 
 Pressure:                  1.000000 atm.
 Temperature:             298.150000 K
 
 
 
 Moments of Inertia (and direction vectors)
 ==========================================
 
           1.9638          4.4225          6.3862
 ------------------------------------------------
           1.0000          0.0000          0.0000
           0.0000          0.0000          1.0000
           0.0000          1.0000          0.0000
 
 
 The rotational contribution to the molecular entropy includes
 a term, dependent on the symmetry number sigma. The results 
 reported below were computed using sigma = 2, determined from
 the point group symmetry of the input geometry (C(2V)). 
 If this is not the correct symmetry, please contact SCM to report a bug.
 Contributions from frequencies below 20 1/cm are not included in
 the vibrational sums. Their contributions, if any, are reported separately.
 
 
     Temp                                                       Transl     Rotat    Vibrat     Total
     ----                                                       ------     -----    ------     -----
 
     298.15   Entropy (cal/mole-K):                             34.608    10.415     0.013    45.037
              Internal Energy (Kcal/mole):                       0.889     0.889    13.218    14.996
              Constant Volume Heat Capacity (cal/mole-K):        2.981     2.981     0.081     6.043
 
              Summary of energy terms
                                                   hartree              eV         kcal/mol           kJ/mol
                                      --------------------     -----------       ----------      -----------
              Bond Energy:              -0.513171971770898        -13.9641          -322.02         -1347.33
              Internal Energy:           0.023897571375166          0.6503            15.00            62.74
              pV/n = RT:                 0.000944186013486          0.0257             0.59             2.48
              Enthalpy H:               -0.488330214382246        -13.2881          -306.43         -1282.11
              -T*S:                     -0.021398412274880         -0.5823           -13.43           -56.18
              Gibbs free energy:        -0.509728626657127        -13.8704          -319.86         -1338.29
 

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adf/ir.1495851594.txt.gz · 最后更改: 2017/05/27 10:19 由 liu.jun

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