نتایج جستجو برای: interstellar molecule
تعداد نتایج: 144199 فیلتر نتایج به سال:
In the development of spectroscopy the symmetric top molecule ammonia, NH 3 , has always played an important role f rom an experimental, theoretical and astrophysical point of view, and it continues to do so. It's pyramidal structure leads to the well known inversional transitions in the 1.2 cm wave region, which were the first molecular lines to be measured in absorption by microwave technique...
Phosphine (PH3) is an important molecule in the chemistry of phosphorus (P)-bearing species interstellar medium. Interstellar PH3 thought to primarily form on icy grains, where several surface processes may occur during and after its formation. To better understand physicochemical behavior grains dense molecular clouds, we performed experimental computational studies reactions phosphine with H ...
Seven particles captured by the Stardust Interstellar Dust Collector and returned to Earth for laboratory analysis have features consistent with an origin in the contemporary interstellar dust stream. More than 50 spacecraft debris particles were also identified. The interstellar dust candidates are readily distinguished from debris impacts on the basis of elemental composition and/or impact tr...
Identifying PAHs in space Midinfrared spectroscopy has shown that polycyclic aromatic hydrocarbons (PAHs) are abundant many astronomical objects, but this technique cannot determine which specific PAH molecules present. Radio astronomy could provide individual identifications if the molecule is sufficiently and a large dipole moment, expected to produce numbers of very weak lines. McGuire et al...
Crossed molecular beam experiments are performed to elucidate the synthesis of the 2,4-penta-diynylidyne [HCCCCC(X (2)Pi)] radical under single collision conditions--a crucial reaction intermediate to form polycyclic aromatic hydrocarbons and carbonaceous nanostructures in the interstellar medium and in combustion flames. The experiments demonstrate that the chemical dynamics of ground state ca...
The launch of the RadioAstron space radio telescope provides a unique opportunity to 1 study the extreme high brightness temperature of Active Galactic Nuclei (AGNs) with unprecedented 2 long baselines of up to 28 Earth diameters. A coordinated ground-based flux density monitoring of 3 RadioAstron targets is essential to determine the effect of interstellar scintillation (ISS) on the Space 4 Ve...
Interstellar material around the Sun is typical for our neighborhood of the Galaxy. The physical properties and kinematics of the partially ionized interstellar material (ISM) near the Sun are typical of warm diffuse clouds in the solar vicinity. The direction of the interstellar magnetic field at the heliosphere, the polarization of light from nearby stars, and the kinematics of nearby clouds ...
From the point of view of radiation safety, interstellar space is not empty. Neutral and ionized interstellar gas and cosmic rays consisting of H and He-nucleons constitute radiation hazard aboard relativistic interstellar ships. Relativistic aberration of cosmic rays is evaluated and radiation doses from oncoming relativistic flow of interstellar gas and cosmic rays are estimated. Necessary sh...
The past century of interstellar dust has brought us from first ignoring it to finding that it is an important component of the interstellar medium and plays an important role in the evolution of galaxies, the formation of stars and planetary systems, and possibly, the origins of life. Current observational results in our galaxy provide a complex physical and chemical evolutionary picture of in...
In the interstellar medium of the Milky Way, certain elements – e.g., Mg, Si, Al, Ca, Ti, Fe – reside predominantly in interstellar dust grains. These grains absorb, scatter, and emit electromagnetic radiation, heat the interstellar medium by photoelectric emission, play a role in the ionization balance of the gas, and catalyze the formation of molecules, particularly H2. I review the state of ...
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