We have observed that P can only interferes on W X-ray emission if they are part of the same compound. We believe there´s a non-radiative energy transfer process ocurring in our system and would like to discuss about these phenomena.
Yes, logically it may be possible for W L-X-ray lines due to Coster-Kronig transitions. There can be change in La-Lb intensity ratios if W is chemically bound. You can cross -check with a pure W foil ...or better still, a thin W-film (few micro-gm/cm2) would give you the pristine ratio of W La-Lb line (i.e. in its pure form)....Of course you can find the relative intensities from literature but it's better to compare in your instrument.