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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
禁蟲 (文壇精英)
密度泛函·小卒
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現(xiàn)在流行的化學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. |
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