▁is ▁linear , ▁but ▁has ▁one ▁Ar − Ar ▁bond ▁shorter ▁than ▁the ▁other . ▁Bond ▁lengths ▁are ▁ 2 . 4 7 ▁and ▁ 2 . 7 3 ▁å ng str ö ms . ▁The ▁dis soci ation ▁energy ▁to ▁Ar ▁and ▁Ar 2 + ▁is ▁ 0 . 2   e V . ▁In ▁line ▁with ▁the ▁mole c ule ' s ▁asym met ry , ▁the ▁charge ▁is ▁calculated ▁as ▁+ 0 . 1 0 , ▁+ 0 . 5 8 ▁and ▁+ 0 . 3 2 ▁on ▁each ▁arg on ▁atom , ▁so ▁that ▁it ▁greatly ▁res emb les ▁ ▁bound ▁to ▁a ▁neutral ▁Ar ▁atom . ▁ ▁Lar ger ▁charged ▁arg on ▁clusters ▁are ▁also ▁detect able ▁in ▁mass ▁spect ro sc opy . ▁The ▁t etra arg on ▁c ation ▁is ▁also ▁linear . ▁▁ icos ah ed ral ▁clusters ▁have ▁an ▁ ▁core , ▁whereas ▁ ▁is ▁dio ct ah ed ral ▁with ▁an ▁ ▁core . ▁The ▁linear ▁ ▁core ▁has ▁+ 0 . 1 ▁charge ▁on ▁the ▁outer ▁atoms , ▁and ▁+ 0 . 4 ▁charge ▁on ▁each ▁or ▁the ▁inner ▁atoms . ▁For ▁larger ▁charged ▁arg on ▁clusters , ▁the ▁charge ▁is ▁not ▁distributed ▁on ▁more ▁than ▁four ▁atoms . ▁Instead ▁the ▁neutral ▁outer ▁atoms ▁are ▁attract ed ▁by ▁induced ▁electric ▁polar ization . ▁The ▁charged ▁arg on ▁clusters ▁abs orb ▁radiation , ▁from ▁the ▁near ▁inf ra red , ▁through ▁visible ▁to ▁ult rav io let . ▁The ▁charge ▁core , ▁,