The catalyst 1, wherein the alkali metal atoms are {TAIL ~ a mixture} of atoms of lithium and at least one atom selected from the group consisting of sodium, {HEAD ~ potassium}, rubidium, cesium and francium 
The catalyst 1 , wherein the alkali metal atoms are { TAIL ~ a mixture } of atoms of lithium and at least one atom selected from the group consisting of sodium , { HEAD ~ potassium } , rubidium , cesium and francium
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH