Abstract: Components of scientific analytical equipment, such as electron multipliers and modifications thereto, for extending the operational lifetime or otherwise improving performance by way of improved construction. A detector includes one or more electron emissive surfaces and one or more detector elements configured to define on one side an environment internal the detector and on the other side an environment external the detector. The one or more detector elements are configured to inhibit or prevent flow of a gas from the environment external the detector to the environment internal the detector. Such detectors may be used in a mass spectrometry instrument, for example.

Abstract: The present invention relates to electron multiplier apparatus of the type used in ion detectors. In one form, the invention is an electron multiplier having two or more electron emissive surfaces, each having a different composition so as to together limit or overcome an acute gain effect on the electron multiplier due to the exposure of the two or more electron emissive surfaces to water molecules. Alternatively, the multiplier may have a single electron emissive surface of mixed composition comprising a first composition component and a second composition component so as to together limit or overcome an acute gain effect on the electron multiplier due to the exposure of the electron emissive surface to water molecules.

Abstract: A multiplexer output cell (FIG. 1, 15) controls the operation of multiplexer input cells (100, 105) in a multistage multiplexer according to the value of a signal select input (130), and a state control input (180). A signal driver (125) having a number of logical outputs comparable to the number of stages in the multiplexer is used in conjunction with the state control signal (170, 175, 180) to control the power ON/OFF state of each cell in the multiplexer. The multiplexer input and output cells (100, 105, 150) which are in the signal path are set to a power ON condition, while the multiplexer input and output cells (100, 105, 150) which are not in the signal path are set to a power OFF position. In this manner, only those cells which are in the signal path are powered ON, resulting in significant power savings.