Infrared Absorption and Emission Characteristics of Interstellar PAHs

Allamandola, L. J.; Tielens, A. G. G. M.; Barker, John R.

doi:10.1007/978-94-009-3861-8_17

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…Silica is found abundantly in the form of quartz (glass) and amorphous particles in circumstellar and cometary dust [23][24][25]. Recent studies suggest that silica can greatly reduce air pollution by controlling the reaction rates of certain reactions in the atmosphere involving aldehydes [26].…”

Section: Introductionmentioning

confidence: 99%

Visible light scattering properties of irregularly shaped silica microparticles using laser based laboratory simulations for remote sensing and medical applications

Boruah¹,

Ahmed²

2017

Laser Phys.

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Laser based experimental light scattering studies of irregularly shaped silica microparticles have been performed at three incident wavelengths 543.5 nm, 594.5 nm and 632.8 nm supported by laboratory based computations and 3D realistic simulations, using an indigenously fabricated light scattering setup. A comparative analysis of the computational and experimentally acquired results is done and a good agreement is found in the forward scattering lobes in all cases for each of the measured scattering parameters. This study also provides an efficient way of detecting and measuring particle size distribution for irregular micro-and nanoparticles and is highly applicable in remote sensing, atmospheric, astrophysical, and medical applications and also for finding potential health hazards in the form of inhalable and respirable small particulate matter.

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Section: Introductionmentioning

confidence: 99%

Visible light scattering properties of irregularly shaped silica microparticles using laser based laboratory simulations for remote sensing and medical applications

Boruah¹,

Ahmed²

2017

Laser Phys.

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“…Because of this recent interest in interstellar dust there have been a number of recent reviews, including an excellent monograph (Whittet 1992). The proceedings of general conferences on dust (Allamandola and Tielens 1989;Bailey and Williams 1988) are especially useful. Some monographs that explain the physical processes ofscattering and the mathematical tools of calculating cross sections are Martin (1978), Bohren and Huffman (1983, hereafter BH), Kerker (19691, and van de Hulst (1981).…”

Section: Introductionmentioning

confidence: 99%

Observations and theories of interstellar dust

Mathis

1993

Rep. Prog. Phys.

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Interstellar dust has a major effect on the Universe and our view of it by strongly affecting the physical and chemical processes within the interstellar medium. Its properties are best determined by the wavelength dependence of its extinction (scattering plus absorption), reflection from nearby stars, emissions (especially in certain near-infrared bands, along with continuum), and polarization of starlight by aligned grains. There are other clues as well, such as the depletion of certain elements from the gas phase onto the grains.The extinction varies strongly with direction, typically with the outer parts of molecular clouds having less extinction in the ultraviolet (relative to the visual) than the diffuse interstellar medium. There is a rather well defined one-parameter mean extinction law extending over the whole range of wavelengths for which observations are available.There are several rival theories regarding the nature of the grains and of their evolution. Most have a common base: that amorphoos silicate materials and hydrogenated carbon are almost surely important constituents of grains. Various ideas regarding the arrangements are reviewed.

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Diffusive grain-surface chemistry involving the atoms and diatomic molecules of two elements

Rae

Green

Hartquist

et al. 2003

A&A

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Abstract.A model of the grain surface chemistry involving the accretion of atoms of two different elements, X and Y, and their reactions to form species X 2 , XY, and Y 2 was examined for a wide range of choices for the values of its three free parameters -the accretion rate of X and Y, the desorption rate of X and the grain surface sweeping time of Y, all considered relative to the grain surface sweeping rate of X. Relative production rates of the diatomics were calculated with five methods involving, respectively, a high-order truncation of the master equation, a low-order truncation of the master equation, the standard deterministic rate equation approach, a modified rate equation approach and a set of approximations which are in some cases appropriate for accretion dominated chemistry. The accuracies of the relative production rates calculated with the different methods were assessed for the wide range of model parameters. The more accurate of the low-truncation master equation calculations and the standard deterministic rate equation approach gives results which are in most cases within ten or twenty per cent of the results given by the high-truncation master equation calculations. For many cases, the more accurate of the low order truncation and the standard deterministic rate equation approaches is indicated by a consideration of the average number of atoms of the two species on the grain's surface.

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Infrared Absorption and Emission Characteristics of Interstellar PAHs

Cited by 3 publications

References 27 publications

Visible light scattering properties of irregularly shaped silica microparticles using laser based laboratory simulations for remote sensing and medical applications

Visible light scattering properties of irregularly shaped silica microparticles using laser based laboratory simulations for remote sensing and medical applications

Observations and theories of interstellar dust

Diffusive grain-surface chemistry involving the atoms and diatomic molecules of two elements

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