 <unk> , the perxenate compounds are used as oxidizing agents in analytical chemistry . Xenon difluoride is used as an <unk> for silicon , particularly in the production of <unk> systems ( <unk> ) . The <unk> drug 5 @-@ <unk> can be produced by reacting xenon difluoride with <unk> . Xenon is also used in protein crystallography . Applied at pressures from 0 @.@ 5 to 5 MPa ( 5 to 50 <unk> ) to a protein crystal , xenon atoms bind in predominantly hydrophobic cavities , often creating a high @-@ quality , <unk> , heavy @-@ atom derivative , which can be used for solving the phase problem . 
