Abstract: A mass spectrometer according to the present invention includes: an ion source; a mass analyzer for analyzing ions generated by the ion source with their mass to charge ratio; an ion lens composed of platelet electrodes of an even number no less than four arranged radially and symmetrically around an ion optical axis connecting the ion source and the mass analyzer; and a voltage generator for applying a voltage composed of a DC voltage and an RF voltage to a group of alternately arranged platelet electrodes and for applying another voltage composed of the same DC voltage and another RF voltage having the same frequency and the opposite polarity to the other group of alternately arranged platelet electrodes. When ions are introduced into the ion traveling space defined by the inner surfaces of the platelet electrodes, the ions travel along the ion optical axis and converge to a rear focal point of the ion lens, while they are vibrated by the voltages applied to the platelet electrodes.

Abstract: When ions are introduced from outside into the ion trap space, a static electric field having equi-voltage surfaces concave to the entrance hole is formed in the ion trap space. For ions obliquely entering the ion trap space, such a static electric field makes the ions cross the equi-voltage surfaces at almost perpendicular angles. Owing to such configuration, ions are effectively decelerated, and enough time can be secured until ions of larger mass-to-charge ratios assuredly enter the ion trap space.

Abstract: When ions are introduced from outside into the ion trap space, a static electric field having equi-voltage surfaces concave to the entrance hole is formed in the ion trap space. For ions obliquely entering the ion trap space, such a static electric field makes the ions cross the equi-voltage surfaces at almost perpendicular angles. Owing to such configuration, ions are effectively decelerated, and enough time can be secured until ions of larger mass-to-charge ratios assuredly enter the ion trap space.

Abstract: In an ion trap mass spectrometer, between an ion supply source and an ion trap, there are disposed an entrance gate electrode, an ion storing section for holding ions by accumulating them near an exit side by means of an RF voltage with an axial electric potential field inclined from an entrance side to the exit side, and an exit gate electrode. When the ions are accumulated near the exit side, the exit gate electrode is opened to thereby introduce the ions in the pulse state into the ion trap. At this point, a voltage is not applied to a ring electrode of the ion trap, so that repulsion due to the voltage of the ring electrode is eliminated. Thereafter, when maximum amount of ions stay inside the ion trap, ring RF voltage is suddenly applied. Thus, the maximum amount of the ions can be introduced into the ion trap.

Abstract: In a resistance welding machine, an arm including one electrode tip, a drive unit including a linear guide for driving another electrode tip corresponding to the one electrode tip, and a welding unit including a welding transformer for passing a secondary current through a gun bracket for supporting the present resistance welding machine on a robot and/or the present resistance welding machine, can be mounted and removed individually as a unit with a common base or a rail main body including the linear guide as the reference thereof.

Abstract: A motor-driven resistance spot welding machine includes: a drive rod having an electrode tip on an end thereof and making a linear motion; a linear guide for guiding the linear motion of the drive rod, the linear guide including a bearing; and a reduction gear being supported by a gun arm or a gun bracket. The machine also linearly drives the drive rod in an electrode force direction by transmitting an output torque of an electric motor to the reduction gear. In the machine, a rear portion of the drive rod is connected to a swing lever through a link, the swing lever being secured either to an output shaft of the reduction gear or to a main body of the reduction gear, whereby an arcuate motion is transmitted to the swing lever by an output of the electric motor, and is then converted into a linear motion of the drive rod by the link to thereby drive the drive rod so as to apply electrode force.

Abstract: In an ashing method for ashing a wafer having an aluminum wiring layer etched by a chlorine containing gas, the wafer is ashed under the conditions that a mixture gas composed of an oxygen gas and at least one kind of alcohol gas selected from CH.sub.3 OH, C.sub.2 H.sub.5 OH, n--C.sub.3 H.sub.7 OH, and i--C.sub.3 H.sub.7 OH is used as an ashing gas, a flow ratio between the alcohol gas and the oxygen gas is set in the range of 1:1 to 1:5, pressure in an ashing chamber is set to 200 Pa or more, and temperature in the ashing chamber is set in the range of 200.degree. C. to 270.degree. C. Accordingly, corrosion in the aluminum wiring layer due to a residual component of the chloride containing gas in a photoresist film can be prevented.

Abstract: Quantitative assay and reagent for the determination of chlorine ion in body fluid. Body fluid is contacted with a reagent which includes deactivated .alpha.-amylase, a compound capable of chelating calcium ion, a calcium chelate compound, and an .alpha.-amylase activity-measuring substance; the amount of .alpha.-amylase activity is proportional to the amount of chlorine ion present in the body fluid. The assay is suitable for automation.

Abstract: Penicillin or related substances are added during the course of the cultivation of a streptococcus to recover SPF-100 from the culture broth. SPF-100 exhibits a broad range of molecular weight and may be classified into SPF-1 and SPF-2.SPF-100 has a direct cancericidal effect and an immunoactivation effect.