A magnetic or electric system having a one dimensional magnetic field gradient, such as produced by a Stern Gerlach dipole magnet or two parallel electrode electric field generator and as described more fully below with respect to FIG 4, may be used but would be limited as to the width of the molecular beam which could be directed through the magnetic or electric field gradient and thus in turn limit the quanitity of {HEAD ~ molecular gas} which could be flowed through {TAIL ~ the system} and separated 
A magnetic or electric system having a one dimensional magnetic field gradient , such as produced by a Stern Gerlach dipole magnet or two parallel electrode electric field generator and as described more fully below with respect to FIG 4 , may be used but would be limited as to the width of the molecular beam which could be directed through the magnetic or electric field gradient and thus in turn limit the quanitity of { HEAD ~ molecular gas } which could be flowed through { TAIL ~ the system } and separated
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