F ▁cluster ▁has ▁a ▁linear ▁shape . ▁The ▁arg on ▁atom ▁is ▁closest ▁to ▁the ▁ch lor ine ▁atom . ▁ ▁Linear ▁Ar Br Cl ▁can ▁also ▁rear range ▁to ▁Ar Cl Br , ▁or ▁a ▁T - sh aped ▁is omer . ▁ ▁Multiple ▁arg on ▁atoms ▁can ▁" sol v ate " ▁a ▁water ▁mole c ule ▁forming ▁a ▁mon ol ayer ▁around ▁the ▁H 2 O . ▁Ar 1 2 · H 2 O ▁is ▁particularly ▁stable , ▁having ▁an ▁ icos ah ed ral ▁shape . ▁M ole cules ▁from ▁Ar · H 2 O ▁to ▁Ar 1 4 · H 2 O ▁have ▁been ▁studied . ▁ ▁Ar B H ▁was ▁produced ▁from ▁bor on ▁mon oh yd ride ▁( B H ) ▁which ▁in ▁turn ▁was ▁created ▁from ▁di bor ane ▁by ▁way ▁of ▁an ▁ult rav io let ▁ 1 9 3   nm ▁las er . ▁The ▁B H - arg on ▁mixture ▁was ▁expanded ▁through ▁a ▁ 0 . 2   mm ▁diameter ▁no zz le ▁into ▁a ▁vac u um . ▁The ▁gas ▁mixture ▁co ols ▁and ▁Ar ▁and ▁B H ▁combine ▁to ▁yield ▁Ar B H . ▁A ▁band ▁spectrum ▁that ▁comb ines ▁the ▁A 1 Π ← X 1 Σ + ▁electronic ▁transition , ▁with ▁v ibration ▁and ▁rotation ▁can ▁be ▁observed . ▁The ▁B H ▁has ▁sing let ▁spin , ▁and ▁this ▁is ▁the ▁first ▁known ▁van ▁der ▁Wa als ▁complex ▁with ▁a ▁sing let ▁spin ▁pair ▁of ▁atoms .