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在G16中容易实现,按 http://gaussian.com/opt/ 中对GIC的说明写出相应变量即可,比如其中就有扫描团簇质心距离的例子:
- The following example first defines the centroids of two fragments. Then, it defines the interfragment distance as an optimization coordinate:
- Define the center of Fragment 1, but don't include it in the optimization.
- XC1(Inactive)=XCntr(1-10)
- YC1(Inactive)=YCntr(1-10)
- ZC1(Inactive)=ZCntr(1-10)
- Define the center of Fragment 2, but don't include it in the optimization.
- XC2(Inactive)=XCntr(11-21)
- YC2(Inactive)=YCntr(11-21)
- ZC2(Inactive)=ZCntr(11-21)
- Define the distance F1-F2 and include it in the optimization. Its value will be reported in Å:
- F1F2=sqrt[(XC1-XC2)^2+(YC1-YC2)^2+(ZC1-ZC2)^2]*0.529177
- The following example requests a relaxed PES scan over the same coordinate:
- F1F2(NSteps=10,StepSize=0.2)
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