他说「同一种元素的原子有相同的重量(weight)，不同元素的原子有不同的重量。」因此atomic weight在中文里翻译成了「原子量」。但是当时由于重量和质量(mass)是相同的概念，因此虽然实际中获得的都是原子的相对质量，但仍然称作原子量。 20世纪初，物理学家采用质谱技术测量原子质量，使用了在物理学上比...
relative isotopic mass 系指每一种 isotope o既相对质量，而呢个relative mass，就当成系o个只同位素o既 mass number (即 proton no. + neutron no.) 举例黎讲，carbon 有三种同位素，分别系 C-12、C-13 同埋 C-14，佢地o既质量数---12、13 同埋 14 就系分别三只同位素o既 relative isot...
Relative isotopic mass** 是指一个同位素相对于碳-12的质量比值。它的定义如下：The mass of an atom of an isotope relative to 1/12 the mass of an atom of carbon-12. （一个同位素的原子质量相对于碳-12中一个原子的1/12的质量的比值。）[作揖]相对于碳-12的相对同位素质量可以通过以下...
Relative isotopic mass,英文定义如下: The relative isotopic mass of an atom is the ratio of its atomic mass to the atomic mass of a reference isotope of the same element. It is used to account for the different masses of atoms that have different isotopes....
Relative Isotopic Mass- This is the ratio of the mass of a single atom to the mass of a unified atomic mass unit. This is synonymous with atomic mass. Standard Atomic Weight- This is the expected atomic weight or relative atomic mass of an element sample in the Earth's crust and atmosph...
phases is not related to nuclear mass. However, in quantum physics, both the vibration effect and the zero point energy are related to nuclear mass (e.g., the zero energy of6Li is7/6times the zero energy of7Li) [16]. Therefore, the quantum effect leads to differences in isotopic ...
J.A.: The prediction of relative abundance of isotopic clusters in mass spectrometry of coordination and organometallic compounds - Gorączko, Szymura - 1999 () Citation Context ...ch as M – H, M − H2,or M − (H2 + H), as can be theoretically predicted [1]. The intensities ...
Mass Spectrometry Using Isotopic Variants of Cholamine. Analytical Biochemistry . 2007Lamos, S. M.; Shortreed, M. R.; Frey, B. L.; Belshaw, P. J.; Smith, L. M. Relative Quantification of Carboxylic Acid Metabolites by Liquid Chro- matography-Mass Spectrometry Using Isotopic Variants of ...
An objective of the invention is therefore to provide a device for isotopic measurements of at least one gaseous constituent from a fluid, which device can readily be arranged in the vicinity of an oil well or a drilling site in order to obtain “on-line” measurements while maintaining an ...
In stellar evolution theory, the fractional abundance of H by mass is known as X, that of He is known as Y, and that of all other elements are known as Z. In stars, the abundances are determined from the strengths of absorption lines in the spectrum combined with other parameters in ...