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[求助]
如何判斷兩個結(jié)構(gòu)之間的能量勢壘與結(jié)構(gòu)穩(wěn)定性之間的關(guān)系
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專家給的審稿意見,不知怎么解決 3) On page 4 (3.1 Stability) and Table 1 the authors compare different configurations and note that the differences in energies are small. Although the relative value of the energies is small, there is still a difference of about 50meV between the various configurations, which is substantially higher than the thermal energy at room temperature. It is thus likely that the system will be found in the configuration with lowest energy at room temperature. The authors should discuss in a few sentences if there is an energy barrier between configurations and how large that barrier is. Configuration Ead(eV) H(T1-T2) -2.761 H(T1-T3) -2.606 H(B1-B2) -2.718 H(B1-B3) -2.771 哪位大俠幫忙看一下,不勝感激,這四個結(jié)構(gòu)穩(wěn)定性與他們之間的能量差值,thermal energy at room temperature,還有結(jié)構(gòu)間的能壘有什么關(guān)系,計算兩個結(jié)構(gòu)之間的能壘是用過渡態(tài)計算的,能壘要和什么比較才能判斷出穩(wěn)定性,謝謝 |
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thermal energy是指kbT, T=300 K,也就是26 meV。當(dāng)能量差在這個量級時,能量高的configuration仍然有不可省略的Boltzmann distribution。當(dāng)能量差>>這個數(shù)值時,能量高的configuration就可以被忽略掉了,因為exp(-E/kbT)<<1。這個是你的第一個問題 兩個結(jié)構(gòu)之間的轉(zhuǎn)變研究不是一個trivial的問題,甚至可以單獨寫片paper,比如Henkelman前不久就發(fā)了篇金剛石石墨結(jié)果轉(zhuǎn)變的paper。所以你可以argue一下,說通過這些結(jié)構(gòu)的相似性,這些相變可能有或者沒有kinetic barrier,blablabla |
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