Dear Sathish, You are right to be dubious about your Mn2O3 spectra, it looks to have much too small a white line compared to literature data and thus probably suffers from Some sort of thickness effects. You can find some MnOxide spectra in Matt's data base http://cars9.uchicago.edu/cgi-bin/newville/Model-Search.cgi however the resolution may be different to wherever you collected your data, but the spectra should be better. Assuming all your data was collected at the same time the edge position of your sample suggests by inspection that it is mainly Mn(IV), In the recess of my mind i know people have published nicely correlated pictures of oxo-Mn compounds edge positions against oxidation states to get a nice linear plot. I am sure you can find this if you search for it in google scholar or the like. However there are several different isomorphs of MnO2 and they have different XANES/EXAFS , thus LCF will only work if you have spectra of all of them (or at least all the types in your sample) Thus unless you are sure that delta is the only type in your sample (by XRD?) , LCF is not likely to get you very far. Given the edge position ab initio fitting might work OK. Otherwise you need to track down absorption spectra of the other isomorphs and try again. For LCF to work well (or at all) you need to have a basis set of all the components in your sample not just one for each possible oxidation state. HTH Regards Fred -- This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail. Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd. Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message. Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom