Theoretical study of basis set effects on the nano intermolecular potential energy surface of alanine - methionine: Calculation of second-virial coefficients
Yazarlar (3)
M. Khaleghian Islamic Azad University, Science And Research Branch, İran
Prof. Dr. Majıd MONAJJEMI Islamic Azad University, Science And Research Branch, İran
Dr. Öğr. Üyesi Fatemeh MOLLAAMIN Islamic Azad University, Qom Branch, İran
Makale Türü Özgün Makale (ESCI dergilerinde yayınlanan tam makale)
Dergi Adı International Journal of Physical Sciences
Dergi ISSN 1992-1950
Makale Dili İngilizce Basım Tarihi 01-2011
Cilt / Sayı / Sayfa 6 / 1 / 121–127 DOI
Makale Linki http://www.scopus.com/inward/record.url?eid=2-s2.0-79952157816&partnerID=MN8TOARS
Özet
The potential energy of Alanine-Methionine was studied on the basis of ab initio calculations performed by using the HF,DFT-B3LYP and MP2 methods with 6-31G and 6-31G* basis sets. The following trends with basis set can be deduced for the depth (De= -Eint (Re) = -Emin) of the potential well of the calculated intermolecular potential energy surfaces (IPSs). In ab initio calculations the basis set superposition error (BSSE) is important. This error can be eliminated to some extent by using the counterpoise correction method (CPC). In this work, to estimate the interaction energy U(r) in the system we use the Morse potential model, and we estimate adjustable parameters used in the Morse model and theoretically second virial coefficient for the system. To determine the second virial coefficients B2, U(r) is used to obtained the model's parameters over the range of temperatures of interest. © 2011 Academic Journals.
Anahtar Kelimeler
Basis set superposition error | Counterpoise correction method | HF and DFT-B3LYP method | Ips | MP2 | Second virial coefficient
BM Sürdürülebilir Kalkınma Amaçları
Atıf Sayıları
Web of Science 60
Scopus 5

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