基本释义
相关例句
1.A type of atom specified by its atomic number, atomic mass, and energy state, such as carbon14
2.Any of two or more kinds of atoms having the same atomic mass but different atomic numbers.
3.Of or relating to an isotope with an atomic mass greater than the average mass of that element.
4.(physics, chemistry) being or containing an isotope with greater than average atomic mass or weight.
5.Since 1998 Archimedes Technology Group in San Diego has been developing a filtering method that works via atomic mass rather than chemical properties.
6.A synthetic element produced in trace quantities by helium isotope bombardment of curium. All isotopes are radioactive, chiefly by emission of alpha particles. Atomic number98; mass numbers244 to254; half-lives varying from25 minutes to800 years.
7.Abstract: Analytical methods for impurities in tungsten and tungstic compounds in recent 10 years were reviewed.Among them were atomic emission spectrometry，atomic absorption spectrometry，mass spectrometry，electrochemical analysis，spectrophotometry and activation analysis.53 references were cited.
8.One of two or more atoms having the same atomic number but different mass numbers.
9.We find that both the transmission and photon emission probabilities as functions of the cavity length have multi-resonance peaks when the separation between two cavities is equal to an integer multiple of half the de Broglie wavelength of the atomic center-of-mass motion.
10.This article reviews recent advances in the determination techniques of minor and trace amounts of iodide, including spectrophotometry, titrimetry, ion-chromatography, high-performance liquid chromatography, gas chromatography, electro-chemical analysis, neutron activation analysis, atomic absorption spectrometry, emission spectrometry, mass spectrometry, X-ray fluorescence spectrometry and thermometry. The separation and concentration methods , and the application of FIA to the determination, are also included.