However, {HEAD ~ the invention} does not exclude {TAIL ~ other gaseous media}, such as for example a mixture containing carbon monoxide, of which excitation produces an emission, still in the infrared, of about 5 μm wave length 
However , { HEAD ~ the invention } does not exclude { TAIL ~ other gaseous media } , such as for example a mixture containing carbon monoxide , of which excitation produces an emission , still in the infrared , of about 5 μm wave length
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH