منابع مشابه
Molecules, ices and astronomy
1.25 Over the past 40 years, about 140 distinct molecular species have been detected in a wide range of astronomical locations (see http://www.cv.nrao.edu/~awootten/ allmols.html). We now know that molecules are present within our galaxy in the atmospheres of cool stars, in stellar envelopes, in planetary nebulae, in the ejecta of novae and supernovae, in diffuse and dense clouds in the interst...
متن کاملDesorption of hot molecules from photon irradiated interstellar ices
We present experimental measurements of photodesorption from ices of astrophysical relevance. Layers of benzene and water ice were irradiated with a laser tuned to an electronic transition in the benzene molecule. The translational energy of desorbed molecules was measured by time-of-flight (ToF) mass spectrometry. Three distinct photodesorption processes were identified: a direct adsorbate-med...
متن کاملSelf-assembling amphiphilic molecules: Synthesis in simulated interstellar/precometary ices.
Interstellar gas and dust constitute the primary material from which the solar system formed. Near the end of the hot early phase of star and planet formation, volatile, less refractory materials were transported into the inner solar system as comets and interplanetary dust particles. Once the inner planets had sufficiently cooled, late accretionary infall seeded them with complex organic compo...
متن کاملAstronomy & Astrophysics H - atom bombardment of CO 2 , HCOOH , and CH 3 CHO containing ices
Context. Hydrogenation reactions are expected to be among the most important surface reactions on interstellar ices. However, solid state astrochemical laboratory data on reactions of H-atoms with common interstellar ice constituents are largely lacking. Aims. The goal of our laboratory work is to determine whether and how carbon dioxide (CO2), formic acid (HCOOH) and acetaldehyde (CH3CHO) reac...
متن کاملTheory of amorphous ices.
We derive a phase diagram for amorphous solids and liquid supercooled water and explain why the amorphous solids of water exist in several different forms. Application of large-deviation theory allows us to prepare such phases in computer simulations. Along with nonequilibrium transitions between the ergodic liquid and two distinct amorphous solids, we establish coexistence between these two am...
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ژورنال
عنوان ژورنال: Astronomy & Geophysics
سال: 2007
ISSN: 1366-8781,1468-4004
DOI: 10.1111/j.1468-4004.2007.48125.x