=   2 8 . 7 1 8   k Hz . ▁There ▁is ▁a ▁possibility ▁that ▁a ▁solid ▁salt ▁of ▁Ar F + ▁could ▁be ▁prepared ▁with ▁ ▁or ▁ ▁an ions . ▁ ▁Ex c ited ▁or ▁ion ized ▁arg on ▁atoms ▁can ▁react ▁with ▁mole cular ▁i od ine ▁gas ▁to ▁yield ▁Ar I + ▁Arg on ▁pl asma ▁is ▁used ▁as ▁an ▁ion isation ▁source ▁and ▁car rier ▁gas ▁in ▁induct ively ▁couple d ▁pl asma ▁mass ▁spect rom etry . ▁This ▁pl asma ▁react s ▁with ▁samples ▁to ▁produce ▁mon atomic ▁ ions , ▁but ▁also ▁forms ▁arg on ▁ox ide ▁( Ar O + ), ▁and ▁arg on ▁nit ride ▁( Ar N +) ▁c ations , ▁which ▁can ▁cause ▁is obar ic ▁inter ference ▁with ▁detection ▁and ▁measurement ▁of ▁iron - 5 6 ▁( 5 6 Fe ) ▁and ▁iron - 5 4 ▁( 5 4 Fe ), ▁respectively , ▁in ▁mass ▁spect rom etry . ▁Pl atin um ▁present ▁in ▁st ain less ▁steel ▁can ▁form ▁plat in um ▁arg ide ▁( P t Ar +) ▁which ▁inter fer es ▁with ▁the ▁detection ▁of ▁u ran ium - 2 3 4 ▁which ▁can ▁be ▁used ▁as ▁a ▁trac er ▁in ▁aqu if ers . ▁Arg on ▁ch lor ide ▁c ations ▁can ▁inter f ere ▁with ▁the ▁detection ▁of ▁ar sen ic ▁as ▁Ar 3 5 Cl + ▁has ▁a ▁mass - to - charge ▁ratio ▁almost ▁identical ▁to ▁that ▁of ▁ar sen ic '