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Type: Artigo de periódico
Title: Density functional theory calculation of 2p spectra of SiH(4), PH(3), H(2)S, HCl, and Ar
Author: Chong, DP
Segala, M
Takahata, Y
Baerends, EJ
Abstract: The method developed recently for prediction of Is electron spectra is now extended to the 2p spectra of SiH(4), PH(3), H(2)S, HCl, and Ar. The method for X-ray absorption spectra involves the use of Delta E for the excitation and ionization energies, and application of time-dependent density functional theory using the exchange-correlation potential known as statistical average of orbital potentials for the intensities. Additional assumptions and approximations are also made. The best exchange-correlation functional E(xc) for the earlier calculation of Delta E in Is spectra of C to Ne (namely Perdew-Wang 1986 exchange, combined with Perdew-Wang 1991 correlation) is no longer used in this work on 2p spectra of Si to Ar. Instead, recently tested Exc good for 2p core-electron binding energies (known as OPTX) for exchange and LYP for correlation, plus scalar zeroth-order regular approximation is adopted here for the Delta E calculations. Our calculated X-ray absorption spectra are generally in good agreement with experiment. Although the predictions for the higher excitations suffer from basis set difficulties, our procedure should be helpful in the interpretation of absorption spectra of 2p electrons of Si to Ar. In addition, we report calculated results for other kinds of electron spectra for SiH(4), PH(3), H(2)S, HCl, and Ar, including valence electron ionizations and excitations as well as X-ray emission. (C) 2008 Wiley Periodicals, Inc.
Subject: X-ray absorption spectra
X-ray emission spectra
2p spectra
Country: EUA
Editor: Wiley-blackwell
Citation: International Journal Of Quantum Chemistry. Wiley-blackwell, v. 108, n. 8, n. 1358, n. 1368, 2008.
Rights: fechado
Identifier DOI: 10.1002/qua.21643
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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