An ion reaction apparatus , comprising: a first plurality of electrodes (610a-d) arranged to define a first pathway therebetween, the first pathway comprising a first axial end configured to receive positively charged ions from an ion source and a second axial end disposed at a distance from the first axial end of the first pathway extending at least partially along a first central axis (A); a second plurality of electrodes (610a-d, 640a, 630a-d, 650b-c) arranged to define a second pathway extending along a second central axis (B), said second pathway intersecting the first pathway at a first intersection point , the second central axis being substantially orthogonal to the first central axis; a third plurality of electrodes (630a-d) arranged to define a third pathway therebetween, the third pathway comprising a first axial end and a second axial end disposed at a distance from the first axial end of the third pathway to transmit at least one of ions and reaction products of said ions out of the ion reaction apparatus, said third pathway extending at least partially along a third central axis (C) substantially orthogonal to the second central axis and intersecting the second pathway at a second intersection point spaced a distance apart from the first intersection point, wherein the first, second, and third plurality of electrodes are configured to couple to an RF voltage source that provides an RF voltage to each of electrodes of the first, second, and third plurality of electrodes; an electron source arranged to introduce electrons into the second pathway along the second central axis extending between the first and second intersection points; and a magnetic field source that is configured to generate a magnetic field parallel to and along said second central axis; wherein the first axial end of the first pathway and the second axial end of the third pathway are collinear. a first plurality of electrodes (610a-d) arranged to define a first pathway therebetween, the first pathway comprising a first axial end configured to receive positively charged ions from an ion source and a second axial end disposed at a distance from the first axial end of the first pathway extending at least partially along a first central axis (A); a second plurality of electrodes (610a-d, 640a, 630a-d, 650b-c) arranged to define a second pathway extending along a second central axis (B), said second pathway intersecting the first pathway at a first intersection point , the second central axis being substantially orthogonal to the first central axis; a third plurality of electrodes (630a-d) arranged to define a third pathway therebetween, the third pathway comprising a first axial end and a second axial end disposed at a distance from the first axial end of the third pathway to transmit at least one of ions and reaction products of said ions out of the ion reaction apparatus, said third pathway extending at least partially along a third central axis (C) substantially orthogonal to the second central axis and intersecting the second pathway at a second intersection point spaced a distance apart from the first intersection point, wherein the first, second, and third plurality of electrodes are configured to couple to an RF voltage source that provides an RF voltage to each of electrodes of the first, second, and third plurality of electrodes; an electron source arranged to introduce electrons into the second pathway along the second central axis extending between the first and second intersection points; and a magnetic field source that is configured to generate a magnetic field parallel to and along said second central axis; wherein the first axial end of the first pathway and the second axial end of the third pathway are collinear. <EOS>