JC Garcia,C Neri,J Massies - 《Journal of Crystal Growth》 被引量: 61发表: 1989年 Molecular beam epitaxial growth of carbon doped GaAs with elemental gallium and arsenic sources and a CCI4 gas source CC1 4 has been used as a carbon acceptor dopant source for GaAs grown by elemental sour...
Reports observations of the lowest rotational transitions of molecular hydrogen that reveal large quantities of gas in the debris disks around the stars beta Pictoris, 49 Ceti, and HD135344. Calculation of gas masses from the data, which are several hundreds to a thousand times greater than those...
For a CO-to-H2 conversion factor similar to that of our Galaxy, the corresponding total mass in molecular hydrogen gas is (1.3 ± 0.0.6) × 109 M⊙ in 3C 31 and (0.31 ± 0.06) × 109M⊙ in 3C 264. Despite their relatively large molecular gas masses and other peculiarities, both ...
Current production involves mainly steam conversion of natural gas or other fossil fuels, which requires high temperature and pressure [6,7]. Recent developments of chemical hydrogen storage materials have inspired work on hydrogen energy conversion. Ammonia borane (AB; NH3BH3), a simple B–N ...
Ions may also be produced by removal of one or more electrons from a molecule using electron ionization (EI). This ionization method is historically the dominant ionization method used in MS (most commonly in gas chromatography–mass spectrometry [GC-MS] instruments) and is still used in some ...
We present high-resolution large-scale observations of the molecular and atomic gas in the Local Group galaxy M 33. The observations were carried out using the HEterodyne Receiver Array (HERA) at the 30 m IRAM telescope in the CO(2–1) line, achieving a resolution of 12″ × 2.6 km s-...
Based on the ^12CO(2→1) emission line we derived L'CO = (3.4 ± 0.6) × 10^10 K km s^1pc^2, that yields a molecular gas mass of MH2 (αCO/4.3) = (1.5 ± 0.3) × 10^11 M and unveils a gas-rich system with gas(αCO/4.3) ≡ MH /M = 3.3 ± 0.7. The extreme ...
Naively assuming a Galactic conversion factor, this places a limit of around 4×10Mon the mass of molecular hydrogen, which is similar to the stellar mass of a present-day giant galaxy, and consistent with gas-to-dust ratios as high as 4400. 展开 ...
Tar is all the organic compounds present in the product gas with a molecular mass larger than benzene [50]. That complex mixture of condensable hydrocarbons condenses below a given temperature, termed as the dew point, the magnitude of which depends on the composition of the tar. There are ...
More than 99% of the mass is in the lowest excitation (T_(ex) ~ 125 K) "warm" component. In the inner galaxy, the warm H_2 emitting gas is ~16% of the CO(1-0)-traced cool molecular gas, while in the outer regions the fraction is twice as high. This large mass of warm ...