It also reduces a length of ionization region and leads to {TAIL ~ a monochromatization} of {HEAD ~ ion beam energy} 
It also reduces a length of ionization region and leads to { TAIL ~ a monochromatization } of { HEAD ~ ion beam energy }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD