19 Result(s)
within
Chapter
L. Colangeli
English
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Chapter
The Giada Experiment for the Rosetta Mission
The Grain Impact Analyser and Dust Accumulator (GIADA) instrument, on board the ESA Rosetta mission, shall analyse the physical and dynamical properties of grains ejected by the target comet and monitor the co...
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Chapter
Matrix Isolation of Amorphous Carbon Grains in Boron-Oxide Glass
Small carbon particles less than 20 nm in diameter are widely regarded as an essential element in models to fit the interstellar extinction curve, particularly in regard to the 217.5 nm “bump”. The techniques ...
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Chapter
IR Reflectance Spectroscopy of Martian Analogues
The purpose of this paper is to show some preliminary results about IR reflectance spectroscopic properties of Martian analogues. We focus on IR measurements because most of Mars radiance is contained in this ...
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Chapter
Temperature Dependence of the Fir Absorption Coefficient for Carbon and Silicate Grains
In this paper we present some preliminary results concerning the measure of the mass absorption coefficient of carbonaceous and silicates grains at various temperatures in the far-infrared spectral region. We ...
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Chapter and Conference Paper
Characterization of Cosmic Materials in the Laboratory
One of the main objectives of modern astrophysics is the characterisation of properties and evolution of materials present in space. Production, processing and analysis of cosmic dust analogues in the laborato...
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Chapter
Morphology, Composition and Mir-Fir Spectroscopy of Silicates of Astrophysical Interest
An important step in the characterisation of cosmic analogues is represented by the study and comparison of morphological, chemical and spectroscopical properties of “crystalline” and “amorphous” materials. In...
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Chapter
Cosmic Dust and Laboratory Simulation: Wishes, Results and Open Problems
Cosmic dust plays an active role in several processes occurring in the interstellar medium, in star formation regions and around evolved stars. Thus, the identification of its properties is one of the major go...
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Chapter and Conference Paper
UV Irradiation of Small Carbon Grains
We present preliminary results of an experiment aimed at simulating the UV processing of hydrogenated amorphous carbon grains occurring in the interstellar medium. UV exposure of these grains induces significa...
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Chapter and Conference Paper
Molecular clouds in LMC: Evaluation of physical parameters by means of MM observations
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Chapter and Conference Paper
Laboratory Spectra of Amorphous and Crystalline Olivine: An Application to Comet Halley IR Spectrum
Among the various silicates proposed as components of cosmic dust grains, olivine is considered one of the most likely materials. In this work we present the infrared spectra of three different types of olivin...
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Chapter and Conference Paper
Simulation in Laboratory of Solid Grains Present in Space
Laboratory data on cosmic dust analogue materials are compared with recent results obtained by means of spectroscopy and mass spectrometry on cometary dust, meteorites and interplanetary dust. Their actual che...
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Chapter and Conference Paper
Carbonaceous Solid Materials: From Laboratory to Space
We present here an updated review of laboratory results obtained from different carbonaceous materials in grain and molecular forms. Temperature behaviour of bands falling between 3 µm and 13 µm is reported for s...
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Chapter and Conference Paper
Optical Properties of Carbonaceous Materials
We discuss the optical properties of carbonaceous materials from the VUV to the FIR. Updated laboratory data on amorphous carbon (HAC) and some PAH mixtures are analysed and compared with relevant literature. ...
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Chapter and Conference Paper
Experimental Evidences for HAC and PAHs Soup in Space
Since its discovery in the spectrum of NGC 7027, the family of weak IR bands, the so called unidentified IR bands (hereinafter UIR), has been found in emission in a wide variety of galactic and extragalactic s...
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Chapter and Conference Paper
Amorphous Carbon and Silicon Carbide Grains Around Carbon Stars
It is well known that a large amount of dust (~ 40%) is produced in the envelopes of late-type stars (Jura, 1985). Moreover, according to Knapp and Morris (1985) a very important contribution to this amount (a...
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Chapter and Conference Paper
Silicate Grains in Space: Laboratory Results
Since their discovery in the spectra of some strong IR sources (Stein et al., 1969; Woolf and Ney, 1969; Forrest et al., 1979), the bands at around 10 µm and 20 µm have been respectively attributed to typical Si-...
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Chapter and Conference Paper
Solid Carbon in Space
Interstellar grains represent an important constituent of matter in space. They are necessary to the cooling and heating mechanisms and play an important role in the gas phase composition of molecular clouds. ...
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Chapter
Vuv to Fir Laboratory Observations on Submicron Amorphous Carbon Particles
We present here a general overview of our experimental results obtained on submicron amorphous carbon particles. Morphological and spectroscopic analysis represent a useful tool to test the particles produced ...
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Chapter and Conference Paper
Physical Properties of Submicronic Carbonaceous Particles Candidate as Cosmic Dust
We present here a compendium of our laboratory measurements of the physical properties of submicronic particles made by some carbonaceous materials candidate as cosmic dust: amorphous carbon, silicon carbide. ...
