Erratum Erratum to ‘‘Characterisation of crystalline C-S-H phases by X-ray photoelectron spectroscopy (XPS)’’ [Cem. Concr. Res. 33 (6) (2003) 899–911] Leon Black a, *, Krassimir Garbev a , Peter Stemmermann a , Keith R. Hallam b , Geoffrey C. Allen b a Forschungszentrum Karlsruhe (ITC-WGT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany b Interface Analysis Centre, University of Bristol, 121 St. Michael’s Hill, Bristol, BS2 8BS, England, UK Received 28 May 2003 We have recently reported the changes arising in the photoelectron spectra of various crystalline calcium silicate hydrates. However, we are aware of a slight difference in our approach to spectral peak fitting with that of many other authors. This difference leads to a sight but consistent discrepancy in binding energies for the Si 2p photoelectron peaks, and thus, in turn, to a similar discrepancy in modified Auger parameter values. We therefore present a new set of Si 2p binding energies and modified Auger parameter values. In accordance with the theory, we fitted two peaks to each Si 2p spectrum. These peaks were fitted with fixed peak intensity ratios, i.e., Si 2p 3/2 /Si 2p 1/2 of 2:1, with both peaks having the same FWHM and a fixed separation of 0.6 eV. Such stringent constraints have been used or derived by others when investigating the bonding nature of silicon compounds [1–3]. However, many other groups, including those cited in our original, fitted only one peak to their Si 2p spectra. There is a consistent discrepancy between the two approaches, and so to enable a ready comparison between our reported binding energies and those of the many other authors, we have recalculated the Si 2p binding energies, fitting only one peak to each spectrum. The new binding energies are shown in Table 1. This, in turn, has an effect upon a 0 , the modified Auger parameter. Thus, the new a 0 values are also given Table 1. It is important to note that in no way does this affect the validity of our conclusions. We merely want to draw attention to the different peak-fitting strategies and make the resultant discrepancy apparent. References [1] R.D. Schnell, D. Rieger, A. Bogen, F.J. Himpsel, K. Wandelt, W. Steinmann, Electronic properties and bonding sites for chlorine chem- isorption on Si(111)-(7  7), Phys. Rev., B 32 (12) (1985) 8057–8067. [2] A. Bansal, X. Li, S.I. Li, W.H. Weinberg, N.S. Lewis, Spectroscopic studies of the modification of crystalline Si(111) surfaces with cova- lently-attached alkyl chains using a chlorination/alkylation method, J. Phys. Chem., B 105 (2001) 10266 – 10277. [3] L. Cooper, L.G. Shpinkova, D.M.P. Holland, D.A. Shaw, A study of the threshold photoelectron spectra and the photoionisation yield curves of the silicon tetrahalides, Chem. Phys. 270 (2001) 363 – 381. 0008-8846/$ – see front matter D 2003 Elsevier Ltd. All rights reserved. doi:10.1016/S0008-8846(03)00207-2 * Corresponding author. Tel.: +49-7247-82-6637; fax: +49-7247-82- 4476. E-mail address: leon.black@itc-wgt.fzk.de (L. Black). Table 1 Original and revised Si 2p 3/2 binding energies and modified Auger parameters Phase Si 2p 3/2 binding energy (eV) Modified Auger parameter (eV) Old New Old New K-Phase 102.86 103.06 1712.28 1712.48 Z-Phase 102.57 102.77 1712.31 1712.51 Truscottite 102.72 102.92 1712.51 1712.71 Gyrolite 102.68 102.87 1712.59 1712.78 11 A ˚ Tobermorite 101.66 101.85 1712.41 1712.6 Xonotlite 102.01 102.2 1712.56 1712.75 Foshagite 101.66 101.86 1712.65 1712.85 Afwillite 101.54 101.74 1712.76 1712.96 C 8 S 5 101.51 101.68 1712.82 1712.99 Hillebrandite 101.63 101.83 1712.6 1712.8 a-C 2 SH 101.54 101.73 1712.89 1713.08 Cement and Concrete Research 33 (2003) 1913 View publication stats View publication stats