▁hydro x am ic ▁acid ▁(" HA "), ▁for ▁example : ▁Ga As ▁+ ▁ ▁+ ▁" HA " ▁→ ▁" G a A " ▁complex ▁+ ▁ ▁+ ▁ 4 ▁ ▁This ▁reaction ▁produces ▁ar sen ic ▁acid . ▁ ▁Electron ics ▁ ▁Ga As ▁digital ▁logic ▁Ga As ▁can ▁be ▁used ▁for ▁various ▁trans istor ▁types : ▁Metal – sem icon duct or ▁field - effect ▁trans istor ▁( ME SF ET ) ▁High - elect ron - m ob ility ▁trans istor ▁( HE MT ) ▁J unction ▁field - effect ▁trans istor ▁( J F ET ) ▁H eter oj unction ▁b ip olar ▁trans istor ▁( H B T ) ▁Metal – ox ide – sem icon duct or ▁field - effect ▁trans istor ▁( M OS F ET ) ▁ ▁The ▁H B T ▁can ▁be ▁used ▁in ▁integrated ▁injection ▁logic ▁( I 2 L ). ▁The ▁earliest ▁Ga As ▁logic ▁gate ▁used ▁Buffered ▁F ET ▁Log ic ▁( B FL ). ▁ ▁From ▁~ 1 9 7 5 ▁to ▁ 1 9 9 5 ▁the ▁main ▁logic ▁families ▁used ▁were : ▁Source - cou ple d ▁F ET ▁logic ▁( SC FL ) ▁fast est ▁and ▁most ▁complex , ▁( used ▁by ▁Tri Qu int ▁& ▁V ites se ) ▁Cap ac itor – di ode ▁F ET ▁logic ▁( C DF L ) ▁( used ▁by ▁C ray ) ▁Direct - cou ple d ▁F ET ▁logic ▁( D CF L ) ▁simplest ▁and ▁lowest