a diatomic molecule contains 2 atoms (e.g. HCl)a triatomic molecule contains 3 atoms (e.g. CO2)and e (Note that molecules must be neutral in charge. If a group of atoms carries positive or negative charge this group of atoms is an ion not a molecule.)参考: CE textbooks ...
the smallest particle of anelementthat has all the properties of the element. adj.,adjatom´ic.ƒThere are two main parts of an atom: thenucleusand theelectroncloud. The nucleus is made up ofprotons, which carry a positive electrical charge, and (except in hydrogen)neutrons, which contai...
Progress in the investigation of absolute transition probabilities (A-values or F values) for ultraviolet lines is reported. A radio frequency ion trap was... WH Parkinson,PL Smith,K Yoshino 被引量: 0发表: 1985年 加载更多来源期刊 Chemistry 1980 研究点推荐 ATOMS Rocks ...
The work function for ions is 1.91 volts at θ=0, and 3.93 volts at θ=0.67. It is shown by experiment that the saturated ion current from a clean hot (1200-1500°K) tungsten filament is an accurate measure (experimental error of about 0.2 percent) of the number of atoms striking the...
Therearethreetypesofnaturalradiation;•AlphaParticles(α)contains2protonsand2neutrons.Analphaparticleisidenticaltothenucleusoftheheliumatomoraheliumion.•BetaParticles(β)incontrast,isafast-movingelectronstravelingatapproximately90%ofthespeedoflightasitleavesnucleus.Itisformedinthenucleusbyconversionofaneutronintoa...
An examination of the shell structure of atoms and ions as revealed by the one-electron potential, The one-electron potential, , appearing in the Schrdinger equation for the charge density is calculated for the neutral atoms from hydrogen to uranium, and the singly positive ions, from helium ...
The smallest quantity of an element that still possesses the characteristics of that element is an atom. Atoms chemically bond together to formmolecules, and the composition of a molecule is given by its chemical formula (O 2, H 2O, C 6H 12O 6). When the atoms in a molecule are ...
The inner-shell photoexcitation of the Rydberg series of Be atoms is explored from both experimental and theoretical points of view. We used synchrotron radiation to photoionize Be atoms and the time-of-flight method to record charge-separated photoion yield spectra. Many new autoionizing resonance...
free of the atom. The net result is that the previously neutral atom gains an electric charge because the number of protons now exceeds the number of electrons by one (sometimes two, if two electrons are knocked out). This process is calledionization, and an ionized atom is called an ion...
Their extraordinary level of control is evidenced by numerous applications in quantum information processing3,4 and quantum metrology5,6. Studies of the long-range interactions between these systems when combined in a hybrid atom–ion trap7,8 have led to landmark results9,10,11,12,13,14,15,...