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Saturday, October 31, 2020 | History

2 edition of Spectroscopic studies of interstellar grains found in the catalog.

Spectroscopic studies of interstellar grains

Fred M. Johnson

Spectroscopic studies of interstellar grains

  • 332 Want to read
  • 12 Currently reading

Published by [National Aeronautics and Space Administration; for sale by the National Technical Information Service, Springfield, Va.] in Washington .
Written in English

    Subjects:
  • Interstellar matter.,
  • Absorption spectra.

  • Edition Notes

    Statementby Fred M. Johnson.
    SeriesNASA contractor report, NASA CR-1667, NASA contractor report ;, NASA CR-1667.
    ContributionsElectro-Optical Systems, inc., Pasadena, Calif., United States. National Aeronautics and Space Administration.
    Classifications
    LC ClassificationsTL521.3.C6 A3 no. 1667
    The Physical Object
    Paginationvii, 103 p.
    Number of Pages103
    ID Numbers
    Open LibraryOL4693753M
    LC Control Number77610040

    Biography: Dr. Louis Allamandola, Senior Scientist in the Space Science Division, is the founder and director of The Astrophysics & Astrochemistry majoring in Chemistry at St. Peter's College in Jersey City, New Jersey he was trained in low temperature spectroscopic techniques under the tutelage of Professor G. C. Pimentel at the University of California at Berkeley, followed. The distribution of ionized hydrogen (known by astronomers as H II from old spectroscopic terminology) in the parts of the Galactic interstellar medium visible from the Earth's northern hemisphere as observed with the Wisconsin Hα Mapper (Haffner et al. ).. In astronomy, the interstellar medium (ISM) is the matter and radiation that exists in the space between the star systems in a galaxy.   The Sciences and Exploration Directorate is the largest Earth and space science research organization in the world. Its scientists advance understanding of the Earth and its life-sustaining environment, the Sun, the solar system, and the wider universe beyond. The Directorate is part of Goddard Space Flight Center (GSFC) in Greenbelt, Maryland.


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Spectroscopic studies of interstellar grains by Fred M. Johnson Download PDF EPUB FB2

Spectroscopic studies of interstellar grains. Washington [National Aeronautics and Space Administration; for sale by the National Technical Information Service, Springfield, Va.] (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors.

Abstract. It is shown that the condition of matching the μm spectrum of the galactic infrared source GC-IRS 7 leads to a remarkably tight convergence on the transmittance curve measured in the laboratory for the dessicated bacterium E.

materials, including certain biochemicals and postulated prebiologic compounds, are shown to be deficient with regard to meeting this by: Spectroscopic Evidence for Interstellar Grain Clumps in Meteoritic Inclusions: Aromatic material extracted from the Murchison meteorite shows an absorption at λ Å similar to the well-known interstellar absorption feature at this wavelength.

This suggests a link between interstellar grain clumps containing organics and the presolar. The microorganism model of interstellar grains is investigated by spectroscopy from the infrared (IR), visible to the ultraviolet (UV) wave regions.E. coli, yeast and spores ofBacillus subtilis exhibit absorption bands at λ= and μm; they also exhibit several absorptions at 6̃8 μm which are in agreement with the observed IS extinction by:   It is shown that the condition of matching the – μm spectrum of the galactic infrared source GC-IRS 7 leads to a remarkably tight convergence on the transmittance curve measured in the laboratory for the dessicated bacterium E.

materials, including certain biochemicals and postulated prebiologic compounds, are shown to be deficient with regard to meeting this by: 1. A theoretical study of the structure and mid infrared (IR) spectra of interstellar hydrocarbon dust analogs is presented, based on DFT calculations of amorphous solids.

The basic molecular. The relationship between presolar grains in meteorites and the interstellar grain population is discussed. Candidate grain materials and abundance constraints are considered.

A dust model consisting of amorphous silicate grains, graphite grains, and polycyclic aromatic hydrocarbons is compared with observed emission and by:   The observations presented here augment an ongoing study of the organic component of the diffuse interstellar medium. These spectra contain a broad feature centered near /cm ( micrometers) and/or a feature with a more complex profile near /cm ( micrometers), the latter of which is attributed to saturated aliphatic hydrocarbons in interstellar grains and is the primary Cited by: Spectroscopic studies of interstellar clouds can now be made in the submillimeter and far-infrared bands, essentially free from the absorbing effects of the Earth's atmosphere, by means of the NASA Kuiper Airborne Observatory.

Also large telescopes for the submillimeter File Size: 4MB. The present writer commenced his studies on interstellar dust precisely 50 years ago. In half interstellar grains were dirty ice particles that nucleated and grew in the tenuous clouds of interstellar space.

This model was soon shown by us to be untenable and we were led to spectroscopy. 3 Extended red emission and PAH-related. Studies of Interstellar Dust: Modelling the Diffuse radiation from interstellar dust grains by Shalima Puthiyaveettil (Author)Author: Puthiyaveettil Shalima.

We present spectroscopic evidence for the composition and evolution of organic molecules in protostellar environments. The principal reaction pathways to complex molecule formation by catalysis on dust grains and by reactions in the Spectroscopic studies of interstellar grains book gas are by: Spectroscopy of interstellar polyaromatic hydrocarbons and their photoproducts of laboratory studies of interstellar ice analogs and models show that the inclusion of PAHs occurring on the surface of the icy mantles of interstellar grains [1], it has been proposed that the.

Astrochemistry is the study of molecular processes in space, with strong links to astrophysics and astrobiology.

This note teaches the concepts necessary to understand astrochemistry: gas-phase and grain surface reactions, and the importance of various chemical Spectroscopic studies of interstellar grains book under different astrophysical conditions. Author(s): Floris van der Tak. We study the grain properties and location of the forsterite crystals in the circumstellar environment of the pre-planetary nebula (PPN) IRAS in order to learn more about the as yet.

Consider a dust grain of radius a, and mass M˛m H, where m H is the mass of an H atom. Suppose that the grain is initially at rest in a gas of H atoms with number density n H and temperature T.

Assume the grain is large compared to the radius of an H atom. Suppose that the H atoms “stick” to the grain when they collide. Carbon monoxide (CO) is the second most abundant gas-phase molecule after molecular hydrogen (H2) of the interstellar medium (ISM).

In molecular clouds, an important component of the ISM, it adsorbs at the surface of core grains, usually made of Mg/Fe silicates, and originates complex organic molecules through the catalytic power of active sites at the grain by: 2.

Spectroscopic studies of interstellar clouds and comets yield abundances for the various constituents. These abundances offer clues to the chemical processes taking place, as well as the physical conditions, in the gas.

This information is needed to understand the events occurring during the formation of stars and the solar by: 3. Methanediol is thought to be formed on the surface of interstellar grains through reactions initiated by UV radiation or cosmic rays (Schutte et al.

A suggested synthetic pathway is the reaction between OH and CH 2 OH, since these radicals form from water and methanol after photolysis (Garrod et al.

These studies?the first glimpses into interstellar ice chemistry through analog studies?show that once accreted onto ice grains PAHs lose their PAH spectroscopic signatures through radiation chemistry, which could be one of the reason for the lack of PAH detection in interstellar ice grains, particularly the outer regions of cold, dense clouds Cited by: In the ranking of cosmic abundance of the elements, carbon is the second element, after oxygen, able to form multiple bonds propagating the formation of a network, thus playing an essential role in the formation of nanometer- to micrometer-sized interstellar dust grains.

Astrophysical spectroscopic observations give us remote access to the composition of carbonaceous and organic interstellar Author: Emmanuel Dartois. The IR spectroscopic characteristics of the samples were analyzed before and after the irradiation in the μm range allowing us to study the structural modifications in the irradiated minerals.

The experiments show that low energy H + (10 keV) and He + (≤50 keV) ions efficiently amorphize crystalline silicates with fluence ≤10 18 ions. In astronomy, the interstellar medium (ISM) is the matter and radiation that exists in the space between the star systems in a matter includes gas in ionic, atomic, and molecular form, as well as dust and cosmic fills interstellar space and blends smoothly into the surrounding intergalactic energy that occupies the same volume, in the form of electromagnetic.

Diffuse interstellar bands (DIBs) are absorption features seen in the spectra of astronomical objects in the Milky Way and other galaxies. They are caused by the absorption of light by the interstellar bands have now been seen, in ultraviolet, visible and infrared wavelengths.

The origin of DIBs was unknown and disputed for many years, and the DIBs were long believed to be. The role and nature of reactions involving grain surfaces as well as new spectroscopic observations of interstellar and circumstellar regions are topics presented in this special feature.

Interstellar chemistry began in the s with the observation of molecular absorption spectra in distant stars within the galaxy. From Wikipedia, the free encyclopedia Interstellar ice consists of grains of volatiles in the ice phase that form in the interstellar medium.

Ice and dust grains form the primary material out of which the Solar System was formed. Grains of ice are found in the dense. Mid- and far-infrared spectroscopic studies of the influence of temperature, ultraviolet photolysis and ion irradiation on cosmic-type ices.

Moore MH(1), Hudson RL, Gerakines PA. Author information: (1)Astrochemistry Branch, NASA/Goddard Space Flight Center, Greenbelt, MDUSA. [email protected] by: Planetary Sciences: American and Soviet Research/Proceedings from the U.S.-U.S.S.R. Workshop on Planetary Sciences () Chapter: Astrophysical Dust Grains in Stars, the Interstellar.

Physics and chemistry of the interstellar medium. [S Kwok] -- "This book is a graduate-level text covering the fundamental physics and chemistry required for a modern understanding of the interstellar medium.

molecules --Vibrational spectroscopy of polyatomic molecules --Molecular excitation and abundance determination --Interstellar grains.

Spectroscopy / s p ɛ k ˈ t r ɒ s k ə p i / is the study of the interaction between matter and electromagnetic radiation (via electron spectroscopy, atomic spectroscopy, etc).

Historically, spectroscopy originated through the study of visible light dispersed according to its wavelength, by a the concept was expanded greatly to include any interaction with radiative energy as a. Silicate and carbon dust grains are produced in the atmospheres of asymptotic giant branch (AGB) and expelled to the interstellar medium.

The interstellar medium, namely the space between stars, contains dust particles and about different gas-phase species have already been : Eva Mateo-Marti, Olga Prieto-Ballesteros, Guillermo Muñoz Caro, Cristobal González-Díaz, Victoria Mu. Absorption Line Spectroscopic Studies of the Local Interstellar Medium.

Warm (5, K) gas in the interstellar medium is seen only in isolated clouds that can be identified by their kinematics, temperatures, and metal depletions on to grains. He is one of the key proponents and spokesmen of the interstellar polycyclic aromatic hydrocarbon (PAH) model and has driven the extensive Ames laboratory studies of PAHs under relevant interstellar conditions.

He has broad experience with low-temperature spectroscopy and astronomical observation. This thesis presents four optical spectroscopic studies of absorption by matter in the di use interstellar medium on scales ranging from 10AU to 10kpc. The observations investigate two current problems in interstellar medium (ISM) research: small-scale structure (SSS), and the di use interstellar.

Efforts also continue in developing spectroscopic databases for aiding the identification of spectral features of known interstellar species as well as potential interstellar species. For more details, see Frequencies for observed interstellar molecular microwave transitions. Icy dust grains play a key role in the chemistry of the interstellar medium.

The cumulative outcome of recent observations, laboratory studies, and astrochemical models indicates that solid-phase reaction mechanisms may dominate the formation of complex organic molecules such Cited by: Astrochemistry is the study of the abundance and reactions of molecules in the Universe, and their interaction with radiation.

The discipline is an overlap of astronomy and word "astrochemistry" may be applied to both the Solar System and the interstellar study of the abundance of elements and isotope ratios in Solar System objects, such as meteorites, is also called.

@article{osti_, title = {ON THE FORMATION AND ISOMER SPECIFIC DETECTION OF PROPENAL (C{sub 2}H{sub 3}CHO) AND CYCLOPROPANONE (c-C{sub 3}H{sub 4}O) IN INTERSTELLAR MODEL ICES—A COMBINED FTIR AND REFLECTRON TIME-OF-FLIGHT MASS SPECTROSCOPIC STUDY}, author = {Abplanalp, Matthew J.

and Borsuk, Aleca and Jones, Brant M. From Icy Grains to Comets (pp. 97–) S. Weidenschilling pdf ( K) Coupled Physical and Chemical Evolution of Volatiles in the Protoplanetary Disk: A Tale of Three Elements (pp.

–) J. Lunine and D. Gautier pdf ( K) From Interstellar Material to. @article{osti_, title = {KETENE FORMATION IN INTERSTELLAR ICES: A LABORATORY STUDY}, author = {Hudson, Reggie L.

and Loeffler, Mark J., E-mail: @}, abstractNote = {The formation of ketene (H{sub 2}CCO, ethenone) in polar and apolar ices was studied with in situ MeV proton irradiation, far-UV photolysis, and infrared spectroscopic analyses at 10.

EXAFS is a powerful tool for studying the structure of grains in the interstellar medium (ISM). infrared spectroscopy, can also be used to study crystalline dust.

x-ray-spectroscopic.An eclipsing binary star is a binary star system in which the orbit plane of the two stars lies so nearly in the line of sight of the observer that the components undergo mutual eclipses. In the case where the binary is also a spectroscopic binary and the parallax of the system is known, the binary is quite valuable for stellar analysis.Detection.

The molecules listed below were detected by spectral features are generated by transitions of component electrons between different energy levels, or by rotational or vibrational spectra.

Detection usually occurs in radio, microwave, or infrared portions of the spectrum. Interstellar molecules are formed by chemical reactions within very sparse interstellar or.