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keaiweiwei

铜虫 (小有名气)

[求助] 求解气相下自由能的计算

计算气相下的吉布斯自由基能包含哪几项?
之前看有个公式ΔG(gas)=sp+freq,sp对应的是SCF Done那一项的话,那freq中应该对应的是哪项输出值呢?
计算单点能sp后在log文件中找到:SCF Done:  E(RB3LYP) =  -467.480743263     A.U. after   13 cycles
那频率分析freq应该对应于以下log文件中哪一项呢?
Zero-point correction=                           0.111949 (Hartree/Particle)
Thermal correction to Energy=                    0.119330
Thermal correction to Enthalpy=                  0.120274
Thermal correction to Gibbs Free Energy=         0.080062
Sum of electronic and zero-point Energies=           -467.227926
Sum of electronic and thermal Energies=              -467.220546
Sum of electronic and thermal Enthalpies=            -467.219601
Sum of electronic and thermal Free Energies=         -467.259813
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yanrding

金虫 (正式写手)

【答案】应助回帖

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感谢参与,应助指数 +1
gmy1990: 金币+3 2013-05-07 00:04:18
electronic 就是SCF Done能量,
你要的自由能是 Sum of electronic and thermal Free Energies 这一项,
它等于electronic 加上Thermal correction to Gibbs Free Energy 这一项。
华北电力大学(北京)数理学院,计算化学,凝聚态物理。欢迎合作!招硕士/博士研究生,招老师。
2楼2013-04-10 13:50:07
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zt_chem

木虫 (正式写手)

【答案】应助回帖

但是【SCF Done:  E(RB3LYP) =  -467.480743263】+【Thermal correction to Gibbs Free Energy=         0.080062
】并不等于Sum of electronic and thermal Free Energies=         -467.259813
啊,这是为什么呢?
3楼2013-05-06 09:11:08
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