▁much ▁more ▁popular , ▁being ▁much ▁less ▁ris ky ▁and ▁simpler ▁than ▁an ▁actual ▁experiment . ▁This ▁article ▁is ▁mostly ▁based ▁on ▁experimental ▁or ▁observ ational ▁results . ▁ ▁The ▁arg on ▁flu or ide ▁las er ▁is ▁important ▁in ▁phot ol ith ography ▁of ▁sil icon ▁ch ips . ▁These ▁las ers ▁make ▁a ▁strong ▁ult rav io let ▁emission ▁at ▁ 1 9 2   nm . ▁ ▁Arg on ium ▁ ▁Arg on ium ▁( Ar H +) ▁is ▁an ▁ion ▁combining ▁a ▁pro ton ▁and ▁an ▁arg on ▁atom . ▁It ▁is ▁found ▁in ▁inter stell ar ▁space ▁in ▁diff use ▁atomic ▁hydro gen ▁gas ▁where ▁the ▁fraction ▁of ▁mole cular ▁hydro gen ▁H 2 ▁is ▁in ▁the ▁range ▁of ▁ 0 . 0 0 0 1 ▁to ▁ 0 . 0 0 1 . ▁ ▁Arg on ium ▁is ▁formed ▁when ▁H 2 + ▁react s ▁with ▁Ar ▁atoms : ▁ ▁Ar ▁+ ▁ ▁→ ▁Ar H + ▁+ ▁H ▁ ▁and ▁it ▁is ▁also ▁produced ▁from ▁Ar + ▁ ions ▁produced ▁by ▁cos mic ▁ray s ▁and ▁X - ray s ▁from ▁neutral ▁arg on : ▁ ▁Ar + ▁+ ▁H 2 ▁→ ▁* Ar H + ▁+ ▁H ▁ 1 . 4 9   e V . ▁ ▁When ▁Ar H + ▁enc oun ters ▁an ▁electron , ▁dis soci ative ▁recom bin ation ▁can ▁occur , ▁but ▁it ▁is ▁extremely ▁slow ▁for ▁lower ▁energy ▁electrons , ▁allowing ▁Ar H + ▁to ▁surv ive ▁for ▁a