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The best performance (in terms of thrust efficiency and power-to-thrust ratio) can be obtained using high atomic weight alkali metals, such as cesium (Cs, 133 amu) and rubidium (Rb, 85.5 amu). These propellants have a low ionization potential (3.87 eV for Cs and 4.16 eV for Rb), low melting point (28.7 °C for Cs and 38.9 °C for Rb) and very ...
Caesium (IUPAC spelling; [9] also spelled cesium in American English) is a chemical element; it has symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C (83.3 °F; 301.6 K), which makes it one of only five elemental metals that are liquid at or near room temperature .
Surface ionization effect in a vaporized cesium atom at 1500 K, calculated using a grand canonical ensemble.Y-axis: average number of electrons on the atom; the atom is neutral when it has 55 electrons.
Caesium carbonate or cesium carbonate is a chemical compound with the chemical formula Cs 2 C O 3. It is white crystalline solid . Caesium carbonate has a high solubility in polar solvents such as water , ethanol and DMF .
This type of ion gun is easy to operate and generates roughly focused but high current ion beams. A second source type, the surface ionization source, generates 133 Cs + primary ions. [11] Cesium atoms vaporize through a porous tungsten plug and are ionized during evaporation. Depending on the gun design, fine focus or high current can be obtained.
Mass fraction can also be expressed, with a denominator of 100, as percentage by mass (in commercial contexts often called percentage by weight, abbreviated wt.% or % w/w; see mass versus weight). It is one way of expressing the composition of a mixture in a dimensionless size ; mole fraction (percentage by moles , mol%) and volume fraction ...
A metal ion in aqueous solution or aqua ion is a cation, dissolved in water, of chemical formula [M(H 2 O) n] z+. The solvation number , n , determined by a variety of experimental methods is 4 for Li + and Be 2+ and 6 for most elements in periods 3 and 4 of the periodic table .
Caesium permanganate is the permanganate salt of caesium, with the chemical formula CsMnO 4. ... Drift-away oxygen caused an 8% mass loss in the product. [6]