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