I want to perform quantitative analysis for my XPS spectrum using curve fitting approach. I'm Mac user, can anybody recommend me any free source XPS software which can also process .txt files (I have raw data in .txt format).
Please do not attach software. Point to the link where it can be downloaded. This practice may violate the terms of the software release, if not propagate viruses and malware.
Well, the original question was posted some time ago ... but just in case someone has the same problem now:
http://www.igorexchange.com/project/XPStools
This is a program for Igor Pro:
https://www.wavemetrics.com/
which runs just fine with MacOS. There is also a youtube channel that explains how to use it. The current version is for Igor 7. I think you can try Igor for a 30-day period, if you don't want to buy it right away (although your department maybe has a license).