A shutter system could then be used to physically separate {HEAD ~ the non affected molecules} taking {TAIL ~ advantage} of this difference in velocity 
taking
A shutter system could then be used to physically separate { HEAD ~ the non affected molecules } taking { TAIL ~ advantage } of this difference in velocity
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH