The sensor 3, wherein {HEAD ~ the detection head} further comprises {TAIL ~ second laser means} for heating the sample to volatilize the sample 
comprises
The sensor 3 , wherein { HEAD ~ the detection head } further comprises { TAIL ~ second laser means } for heating the sample to volatilize the sample
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH