Just to add;

that paper is available as full-text version also at RG:

Article Ultrasmall and phase-pure W2C nanoparticles for efficient el...

Dear Anjali,

You may take assistance from the XPS database, i.e. NIST database.

Thanks Mrinmoy for that hint;

but 4f7/2 for W2C is not listed there at NIST XPS database (at least not yesterday; only data for WC are available there *)).

*)

https://srdata.nist.gov/xps/EngElmSrchQuery.aspx?EType=PE&CSOpt=Retri_ex_dat&Elm=W

(click on '4f7/2' and press the 'search' button)