{HEAD ~ The desired residence time} within the cracking chamber, which is the time available for photolysis should be in the range of {TAIL ~ a few milliseconds to several hundred milliseconds} 
{ HEAD ~ The desired residence time } within the cracking chamber , which is the time available for photolysis should be in the range of { TAIL ~ a few milliseconds to several hundred milliseconds }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL