▁|| ▁| } ▁ ▁A que ous ▁arg on ▁Arg on ▁dissol ved ▁in ▁water ▁causes ▁the ▁p H ▁to ▁rise ▁to ▁ 8 . 0 , ▁apparently ▁by ▁reducing ▁the ▁number ▁of ▁o xygen ▁atoms ▁available ▁to ▁bind ▁pro tons . ▁ ▁With ▁ice , ▁arg on ▁forms ▁a ▁cl ath rate ▁hyd rate . ▁Up ▁to ▁ 0 . 6   G Pa , ▁the ▁cl ath rate ▁has ▁a ▁cub ic ▁structure . ▁Between ▁ 0 . 7 ▁and ▁ 1 . 1   G Pa ▁the ▁cl ath rate ▁has ▁a ▁t et rag onal ▁structure . ▁Between ▁ 1 . 1 ▁and ▁ 6 . 0   G Pa ▁the ▁structure ▁is ▁body ▁centered ▁orth or h omb ic . ▁Over ▁ 6 . 1   G Pa , ▁the ▁cl ath rate ▁converts ▁into ▁solid ▁arg on ▁and ▁ice ▁VII . ▁At ▁atmos pher ic ▁pressure ▁the ▁cl ath rate ▁is ▁stable ▁below ▁ 1 4 7   K . ▁At ▁ 2 9 5   K ▁the ▁arg on ▁pressure ▁from ▁the ▁cl ath rate ▁is ▁ 1 0 8   MP a . ▁ ▁Arg on ▁flu or oh yd ride ▁Arg on ▁flu or oh yd ride ▁was ▁an ▁important ▁discovery ▁in ▁the ▁re ju ven ation ▁of ▁the ▁study ▁of ▁noble ▁gas ▁chem istry . ▁H Ar F ▁is ▁stable ▁in ▁solid ▁form ▁at ▁temper atures ▁below ▁ 1 7   K . ▁It ▁is ▁prepared ▁by ▁phot ol ysis ▁of ▁hydro gen