Formation of interstellar CCS and CCCS: a case for radical/neutral chemistry?

摘要: Pathways to the abundant sulphur-containing carbon chain molecules, CCS and CCCS, are examined. The previously proposed ion/molecule mechanisms for formation of these species appear satisfactory in case CCS, but arguments CCCS via reactions rely on several assumptions which do not justified absence sufficient experimental evidence. Alternative, radical/neutral pathways (namely C2H with S, CS respectively) can account observed high abundances within TMC-l other objects. Thermochemical aspects various CxS production assessed light recent ab initio calculations chemical concerned. Experimental study reaction CzH CS. is strongly urged.