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【求助】什么軟件里含Pariser–Parr–Pople方法? 已有1人參與
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有沒有什么軟件里含Pariser–Parr–Pople method , 在網(wǎng)上找了找,看了幾篇用PPP方法計算的文章,都很老了,而且沒提到用什么軟件的,該不會是手算的? [ Last edited by yjcmwgk on 2009-11-26 at 13:43 ] |
科研、寫作相關(guān) |
禁蟲 (文壇精英)
密度泛函·小卒
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現(xiàn)在流行的化學(xué)軟件中好像早就沒有PPP這個方法了。我見過的最“新”的用PPP方法的一篇文章是1999年的。其實自從TDDFT,CASSCF等方法可以大量快速運行在通用的電腦上之后,誰還用PPP啊。PPP是個半經(jīng)驗方法,甭理他了。 下面援引http://www.chemistrydaily.com/chemistry/Pariser-Parr-Pople_method上面的資料,這個資料也說了,PPP方法是個半經(jīng)驗的方法,半經(jīng)驗方法也忍了,精度又不如zindo這一族,建議你就別費心思找了: Pariser-Parr-Pople method The Pariser-Parr-Pople method applies semi-empirical quantum mechanical methods to the quantitative prediction of electronic structures and spectra, in molecules of interest in the field of organic chemistry. Previous methods existed, such as Hückel's rule, but were limited in their scope, application and complexity, as is the Extended Hückel's rule . This approach was developed in the 1950s by Rudolph Pariser with Robert Parr and co-developed by John Pople. It is essentially a more efficient method of finding reasonable approximations of molecular orbitals, useful in predicting physical and chemical nature of the molecule under study since molecular orbital characteristics have implications with regards to both the basic structure and reactivity of a molecule. This method used a Zero Differential Overlap (ZDO) approximation to reduce the problem to reasonable size and complexity but still required modern solid state computers (as opposed to punch card or vacuum tube systems) before becoming fully useful for molecules larger than benzene. Originally, Pariser's goal of using this method to predict the characteristics of complex organic dyes, but this was never realized. The method has wide applicability in precise prediction of electronic transitions, particularly lower singlet transitions, and found wide application in theoretical and applied quantum chemistry. The two basic papers on this subject were among the top five chemistry and physics citations reported in ISI, Current Contents 1977 for the period of 1961-1977 with a total of 2450 references. |
禁蟲 (文壇精英)
密度泛函·小卒
木蟲 (正式寫手)
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Zindo里有PPP方法。 我在08年里有三篇文章,都是建立在PPP模型上的工作。個人意見,PPP方法在處理大的共軛體系的光譜時還是有用的(其他方法都無法計算,PPP方法可以用來計算定性或半定量的光譜數(shù)據(jù),盡管現(xiàn)在很少用)。印象中05年有一篇Phys.Rev.Lett.的文章也是用PPP方法計算碳納米管的電子結(jié)構(gòu)的(其中有一個作者Hongbo Zhao,好像現(xiàn)在在香港)。 客觀地說,作為一個半經(jīng)驗?zāi)P,PPP模型是一個逐漸退出歷史舞臺量子化學(xué)方法,暫時在有限的領(lǐng)域里還有用處,F(xiàn)在TDDFT或者CIS已經(jīng)可以用來計算較大體系的激發(fā)態(tài)性質(zhì)。另一方面,凝聚態(tài)物理中的Hubbard模型和PPP模型有很深的淵源,而Hubbard模型及其改進模型在物理上還應(yīng)用的很廣泛。建立在PPP模型上的DMRG方法的文章在07年之前也有不少,最近兩年的我沒有關(guān)注了。 (PPP模型是CNDO近似+pi電子近似的一個理論模型,適用于研究共軛體系的pi電子性質(zhì)) 一點愚見,供參考。 PS:據(jù)我了解,有用Zindo做初步計算,然后從中選取pi軌道,再進行CI計算來研究共軛體系的性質(zhì)的。 [ Last edited by liqx on 2009-8-14 at 12:41 ] |
木蟲 (正式寫手)
| 我說的Zindo是指的Zerner的Zindo軟件。據(jù)我所知清華大學(xué)帥志剛組里一直有人在用。印象中吉林大學(xué)的封繼康教授在Zerner組里工作過,他那邊應(yīng)該也有人用。Zindo是free software, 原來好像是通過郵件索取,現(xiàn)在網(wǎng)上應(yīng)該也可以找得到。最近CCL上有人在討論Zindo的編譯問題,好像Zindo還出了windows版本。我的工作側(cè)重于在PPP模型上檢驗新方法,不在PPP模型本身,雖然所有計算都是基于PPP模型的(J. Comput. Chem., 29, 1650, 2008; Chem. Phys. Lett., 457,276, 2008; Syn. Met., 158, 330, 2008)。 其中的SCF/PPP和CCSD/PPP計算的程序是我們自己開發(fā)的。 |
木蟲 (正式寫手)
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