Abstract: A second gate in an Ion Mobility Spectrometer is used to select or block different time windows of the ion mobility spectrum. A second gate in the Ion Mobility Mass Spectrometer is used to modulate peak intensities in the IMS spectrum, allowing each peak in the IMS spectrum to be unambiguously matched with its set of fragment ions in a subsequent MS-MS mass spectrum.

Abstract: A connector assembly for connecting wire leads of a first cable to corresponding wire leads of a second cable. A terminal housing structure has a first base, and a second base facing opposite to the first base. First pairs of connector terminals are configured to connect with pairs of wire leads of the first cable, and second pairs of connector terminals are configured to connect with pairs of wire leads of the second cable. A wiring board captured between the first and second bases has sets of conductive terminal openings at corresponding locations in the board. The first pairs of connector terminals are mounted on one side of the board in first pairs of terminal openings, and the second pairs of connector terminals are mounted on the opposite side of the board in second pairs of terminal openings which are electrically connected to the first pair of openings. The sets of terminal openings are spaced apart sufficiently to avoid cross-talk between the pairs of connector terminals.

Abstract: A connector assembly for connecting wire leads of a first cable to corresponding wire leads of a second cable. A terminal housing structure has a first base, and a second base facing opposite to the first base. First pairs of connector terminals are configured to connect with pairs of wire leads of the first cable, and second pairs of connector terminals are configured to connect with pairs of wire leads of the second cable. A wiring board captured between the first and second bases has sets of conductive terminal openings at corresponding locations in the board. The first pairs of connector terminals are mounted on one side of the board in first pairs of terminal openings, and the second pairs of connector terminals are mounted on the opposite side of the board in second pairs of terminal openings which are electrically connected to the first pair of openings. The sets of terminal openings are spaced apart sufficiently to avoid cross-talk between the pairs of connector terminals.

Abstract: A spectroscopy instrument that uses spectra produced from random binary sequence modulated data. Statistical estimation techniques are used to achieve resolution enhancement, while properly accounting for the Poisson noise distribution and other artifacts introduced by a modulator or “chopper” or other system components. Indeed, a resolution similar to that of modem spectrometers can be achieved with a dramatic performance advantage over conventional, serial detection analyzers. Both static and dynamic behaviors are theoretically or measured experimentally accounted for in the model as determined. In one embodiment, the finite penetration of the field beyond the plane of the chopper leads to non-ideal chopper response, which is characterized in terms of an “energy corruption” effect and a lead or lag in the time at which the beam responds to the chopper potential.

Abstract: A technique for providing a grid for a gate such as utilized in gating a stream of ions or other particles in a spectrometer instrument. The grid of wires may, for example, be a so-called Bradbury-Nielson Gate that consists of a set of two electrically isolated sets of equally spaced wires that lie substantially in the same plane and alternate in potential. The method utilized to provide is to first fabricate a frame of an insulating substrate having a hole and depositing metal film patterns such that conductive portions are formed on either side of the hole. Conductive portions on either side form a series of terminating pads on the portion of the substrate closest to the hole and a bus bar. Grid wires are then formed by stretching a section of wire with desired constant tension across the hole and bonding the ends of the wire to a respective one of the pads on one side and bus bar on the other side. The method provides a rapid, inexpensive way to fabricate such modulating devices.

Abstract: An electromagnetic wiggler having a cylindrical member, and a central member disposed axially within the cylindrical member, both of which are formed from alternating cylindrical sections of ferromagnetic and non-ferromagnetic material, each sequential pair of these sections being the length of the wiggler's period .lambda..sub.w. The sequence of sections between the inner and outer members is shifted .lambda..sub.w /2, so that ferromagnetic sections of the outer member are disposed radially opposite non-ferromagnetic sections of the inner member, and vice versa. The resultant radial magnetic flux density in the cylindrical gap between the members is larger and sharper than the flux density for the same wiggler without the central member, permitting higher radiated power output, at higher radiation frequencies, for the same energy of input electron beam.