Abstract: A quadrupole mass spectrometer has a housing containing pole rods which define a passage through which ions can pass when the housing is evacuated. RF voltage is supplied to the pole rods to cause ions only of a predetermined mass/charge ratio to pass through the passage. Such ions are detected and their rate of receipt is inducted. The temperature of the RF supply is controlled to enable more consistent analytical results to be attained.

Abstract: A cross-flow nebulizer is manufactured from first and second deformable tubular members each having a substantially constant external diameter and a central passage of substantially constant diameter extending from a forward end to a rearward end. A forward end portion of each tubular member is deformed to provide the forward end with an orifice of reduced diameter of desired size, and the forward end portions of the tubular members are positioned in an angular spaced relationship with the orifices closely adjacent. The relative positions of the orifices are adjusted to provide a satisfactory spray when gas is passed through one tubular member and the other tubular member is connected to a source of liquid, and the tubular members are integrally connected to maintain the forward ends in the adjusted position.