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Titlebook: Computational Aspects for Large Chemical Systems; Enrico Clementi Textbook 1980 Springer-Verlag Berlin Heidelberg 1980 Quantenchemie.Vibra

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发表于 2025-3-21 18:33:57 | 显示全部楼层 |阅读模式
书目名称Computational Aspects for Large Chemical Systems
编辑Enrico Clementi
视频video
丛书名称Lecture Notes in Chemistry
图书封面Titlebook: Computational Aspects for Large Chemical Systems;  Enrico Clementi Textbook 1980 Springer-Verlag Berlin Heidelberg 1980 Quantenchemie.Vibra
描述1. 1 STATEMENT OF THE PROBLEM Quantum chemistry judged not from the ever present possibility of unex­ pected developments but on the basis of the achievements in the last fifty years, is predominantly limited to attempts to solve for the energy and expectation values of wave functions representing, in the limit, an exact solution to the Schroedinger equation. Because of well-known dif­ ficulties in system with more than about 50 electrons, the adopted ap­ proximations are generally rather crude. As examples of quantum chemical approximations we mention the total or partial neglects of electron correlation, the neglect of relativistic effects, the use of subminimal basis sets, the still present neglect of inner-core electrons in semi-empirical methods, the acceptance of the Born-Oppenheimer approximations, and so on. In general, the larger the system, in terms of the number of electrons, the cruder the approxima­ tion. In a way, the present status of quantum chemistry might appear as nearly paradoxical. Indeed, for small systems, where very accurate ex­ periments are often available, and therefore, there is not a great need to obtain (from quantum chemistry) predictions of new data
出版日期Textbook 1980
关键词Quantenchemie; Vibration; atoms; chemical bond; chemistry; deformation; electrons; energy; liquid water; nucl
版次1
doihttps://doi.org/10.1007/978-3-642-93144-4
isbn_softcover978-3-540-10014-0
isbn_ebook978-3-642-93144-4Series ISSN 0342-4901 Series E-ISSN 2192-6603
issn_series 0342-4901
copyrightSpringer-Verlag Berlin Heidelberg 1980
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0342-4901 ems, where very accurate ex­ periments are often available, and therefore, there is not a great need to obtain (from quantum chemistry) predictions of new data 978-3-540-10014-0978-3-642-93144-4Series ISSN 0342-4901 Series E-ISSN 2192-6603
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978-3-540-10014-0Springer-Verlag Berlin Heidelberg 1980
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Structural Prevention of Ethnic Violence, is predominantly limited to attempts to solve for the energy and expectation values of wave functions representing, in the limit, an exact solution to the Schroedinger equation. Because of well-known difficulties in system with more than about 50 electrons, the adopted approximations are generally
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https://doi.org/10.1007/3-540-09455-5ltonian used for atomic systems but with the inclusion of more than one nucleus; the nuclei are kept at fixed positions as is done in atomic computations (Born-Oppenheimer approximation). Thus, the system contains as particles, the m nuclei and n electrons; we briefly designate it as the m,n-system.
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Revisiting Wireless Communications,ions becomes of dominant interest. This point has been fully realized since the beginning of quantum chemistry by those researchers who were interested in transport phenomena in the liquid state and, in general, in thermodynamics.
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Engineering Materials and Processesed complexity in the intermolecular interactions and the importanc of water as a solvent are two of the reasons for this shift. Pioneering studies in this direction have been presented by Baker, et al.(144) where Monte Carlo simulations based on empirical water-water potentials were considered. In t
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