It provides atomic mass, mass excess, nuclear binding energy, nucleon separation energies, Q-values, and nucleon residual interaction parameters for atomic nuclei of the isotope O-18 (Oxygen, atomic number Z = 8, mass number A = 18). Related documents Landolt-Brnstein Homepage Introduction ...
Oxygen is the third most abundant element in the universe by mass, after hydrogen and helium, and the most abundant element by mass in the Earth’s crust. Dioxygen as a gas makes up 20.9% of the volume of Earth’s atmosphere and is also present in the form of water vapor and CO2. O...
Measurement of oxygen isotope ratios ( 18 O/ 16 O) of aqueous O 2 in small samples by gas chromatography/isotope ratio mass spectrometry RationaleOxygen isotope fractionation of molecular O2 is an important process for the study of aerobic metabolism, photosynthesis, and formation of reactive oxygen...
The atomic mass of an atom is the mass of that atom compared to some standard, such as the mass of a particular type of carbon atom. The terms atomic mass and atomic weight are often used interchangeably, although, strictly speaking, they do not mean the same thing. Mass is a measure ...
Oxygen-18 variations in belemnite guards 来自 Elsevier 喜欢 0 阅读量: 117 作者: A Longinelli 摘要: Spot measurements of the oxygen isotopic composition of carbonate were carried out on some Jurassic and Cretaceous belemnites. Both the well preserved and the badly preserved specimens show ...
The intense reactivity of ozone is sometimes explained by suggesting that one of the three oxygen atoms is in an “atomic” state; on reacting, this atom is dissociated from the O3molecule, leaving molecular oxygen. The molecular species, O2, is not especially reactive at normal (ambient) temp...
Stable isotopes are denoted by their atomic mass such as 13C and 12C for the two stable isotopes of carbon, and 18O, 17O, and 16O for the stable isotopes of oxygen. Because the heavy isotope is normally rare (e.g., ∼1.1% for 13C, 0.2% for 18O, and 0.04% for 17O), ...
Atomic Volume(cc/mol):14.0 Covalent Radius(pm):73 Ionic Radius:132 (-2e) Specific Heat(@20°C J/g mol):0.916 (O-O) Pauling Negativity Number:3.44 First Ionizing Energy (kJ/mol):1313.1 Oxidation States:-2, -1 Lattice Structure:Cubic ...
We then employ the experimental atomic structures as input to first-principles-trained machine learning to identify the active sites of the nanocatalysts. Through the analysis of the structure–activity relationships, we formulate an equation termed the local environment descriptor, which balances the ...
(O2) is the radiation chemical yield of molecules per 100 eV of the radiation energy;MO2is the O2molecular mass (g),Aizis the isotope atomic mass (g) andλis the isotope-specific decay constant (y−1). The overall (O2)tvalue summed the contributions from238U,235U,232Th and40K ...