[en] The Naval Research Laboratory's Trace Element AMS system's use of a Pretzel magnet as a recombinator and mass filter offers a unique opportunity to study a new type of time-of-flight (TOF) spectrometry. Mass filtering prior to TOF analysis removes extraneous species, shortening the analysis time for a single beam pulse, thereby improving the duty cycle. Time dilation results from a longer flight path for a heavier mass in the Pretzel magnet. Computer TOF simulations of these factors and the resulting impact on mass resolution for high mass atomic and molecular species are discussed. Initial measurements of carbon and silicon to confirm the validity of the model are presented. (author)

[en] Mass spectrometers of different types are suggested to use for qualitative and quantitative analyses of gas. The operation principles of static and dynamic mass spectrometer are studied. In static mass spectrometers mass separation of ions is performed by changing the value of accelerating voltage in the ion source when retaining the magnetic field intensity. Such devices are stationary. The device mass is conditioned by the magnet mass. Mass separation in dynamic mass spectrometers is dependent on the degree of energy increment of ions in HF-electric fields. Radio frequency mass spectrometers are used with advantage for studying upper layers of an atmosphere and are installed on radiosondes and satellites. The main technical characteristics of the MX-1330 mass spectrometer, the basis of which is the analyzer with 180 deg deviation of an ion beam in the field of permanent magnet, are presented. The device is intended for controlling the environment and permits to analyze gases with a molecular mass up to 450 using various systems of gas filling. The error of determination of molecular substance is not greater than +-3 %; the magnetic field intensity constitutes 4.8x10⁵ A/m; the supply voltage is 380/220 V; the total power is 5.0 kVA

[en] The mass-spectrometer unit presented comprises: means for measuring the mass-spectra of compound-element samples, means for introducing a sample of pure elements or mixtures of elements into said measuring means, means for controlling the operation of said measuring means, and means for data input and output

No abstract available

[en] Container for injection into mass-spectrometer during several minutes of a solid withoud its contact with air is described. The container consists of cylindrical quartz body and a glass umbrella-shaped cover. The investigated substance is admitted to a box with inert atmosphere. After sealing the air from the inlet chamber is evacuated by a roughing-vacuum pump and the cover is thrown off to the bottom of sluice chamber. The container is in air without its inner permeation for 4-5 min, providing cyclohexane is used as a volatile liquid. The container permits to carry out investigations of solids instable in air using commercial mass-spectrometers with vacuum lock

[en] High vacuum research and results at I.C.I.S. Ramnicu Valcea are reviewed. The whole range of turbo-molecular pumps with pumping speeds between 100 l/s and 2000 l/s is described. The functional characteristics of these pumps are presented. Additionally, we studied the cryopumping in the same range of pressure. As a result of this research we designed and developed an experimental model of continuous-flow cryogenic pump. A performance comparison between turbo-molecular and cryogenic high-vacuum pumps was made using a quadrupole mass spectrometer. (Author)

[en] A molecular-beam mass-spectrometer sampling apparatus has been developed to study the reactive species concentrations as a function of position in a rocket-motor combustion chamber. Unique design features of the sampling system include (a) the use of a multiple-nozzle end plate for preserving the nonuniform properties of the flow field inside the combustion chamber, (b) the use of a water-injection heat shield, and (c) the use of a 300 CFM mechanical pump for the first vacuum stage (eliminating the use of a huge conventional oil booster pump). Preliminary rocket-motor tests have been performed using the highly reactive propellants nitrogen tetroxide/hydrazine (N₂O₄/N₂H₄) at an oxidizer/fuel ratio of 1.2 by weight. The combustion-chamber pressure is approximately 60psig. Qualitative results on unreacted oxidizer/fuel ratio, relative abundance of oxidizer and fuel fragments, and HN₃ distribution across the chamber are presented

[en] This invention concerns a panoramic detector of ions spatially distributed into different beams. This detector can be employed for detecting charged particles, particularly in mass spectrography. Its characteristics feature: - a plane symmetry diaphragm, with an opening for the passage of these beams, the diaphragm being raised to a given potential, - an acceleration electrode provided with an opening located opposite the opening of the diaphragm. This acceleration electrode has a plane symmetry and is brought to a negative potential in relation to that of the diaphragm, - a plane electrode located opposite the accelerator electrode and brought to a negative potential in relation to that of the diaphragm, the absolute potential value of this plane electrode being greater than the absolute value of the acceleration electrode potential

[en] In the July issue, in the article, “Dynamic Range of Mass Accuracy in LTQ Orbitrap Hybrid Mass Spectrometer” by Alexander Makarov, Eduard Denisov, Oliver Lange, and Stevan Horning (Vol. 17, no. 7, pages 977–982), Figure 4 was printed in black and white, when it should have been published in color. The correct rendering of the figure, with its accompanying legend, is provided below:

[en] This invention relates to an improvement to the systems for measuring ionic currents in mass spectrometry, comprising a diaphragm with an analytical slit for separating the various ion beams according to the mass/charge ratio of the ions, an electron multiplier, the first dynode of which is placed so as to receive the ions of a beam transmitted by the analytical slit during a pre-set time interval, and an instrument to measure the current delivered by the multiplier. The invention reduce to a negligible amount the effects due to the lack of homogeneity of the first dynode. Under this invention, the system comprises an enlarger of the beam impact area during successive time intervals of duration Δt included in the time interval T during which the entire beam passes through the slit. The enlargement is produced by acting on the beam after it has passed through the analytical slit