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AbstractAbstract
[en] High signal-to-noise ratio 5-8 μm spectra of four sources embedded in molecular clouds are presented. All four sources show evidence for the presence of absorption features. The shape of these features changes, however, dramatically from source to source. They range from two relatively narrow bands at 6.0 and 6.8 μm in W33A to a broad, shallow feature, which extends from about 5.2 to 7.8 μm and shows some structure, in Mon R2-IRS2, BN, and NGC 2264
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Journal Article
Journal
Astrophysical Journal; ISSN 0004-637X;
; v. 287(2); p. 697-706

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AbstractAbstract
[en] A classification scheme for QSO absorption line spectra is described which ascribes the origin of the lines to at least four mechanisms: (A) Explosive ejection of material at speeds up to 0.1 c. (B) Absorption by highly ionized material moving in a rich cluster in which the QSO is embedded. (C-1) Cosmologically distant intervening material with 'normal' abundances, probably associated with large galactic halos. (C-2) Cosmologically distant intervening material consisting of primordial uncondensed gas. Examples of each type of spectra are given and their ionization and other spectral characteristics discussed. The similarity between the development of novae spectra and a possible evolutionary sequence of the explosive ejecta of type A is striking and suggestive. Several difficulties and unsolved problems involving this scheme are noted. Finally, the author speculates on the interpretation of two interesting objects (PKS 0237-23 and the 'twin quasars' 0957+56A,B) in the context of this scheme. (Auth.)
Primary Subject
Source
Abell, G.O. (California Univ., Los Angeles (USA)); Peebles, P.J.E. (Princeton Univ., NJ (USA)) (eds.); International Astronomical Union; 356 p; ISBN 90-277-1118-6;
; 1980; p. 107-117; D. Reidel; Dordrecht, Netherlands; International Astronomical Union symposium no. 92 on objects of high redshift; Los Angeles, CA, USA; 28 - 31 Aug 1979

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Book
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Conference
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AbstractAbstract
No abstract available
Primary Subject
Source
Sherwood, V.E.; Plaut, L. (eds.); International Astronomical Union; p. 225-227; ISBN 902770578X;
; 1975; D. Reidel; Dordrecht, The Netherlands; Variable stars and stellar evolution; Moscow, USSR; 29 Jul 1974; Published in summary form only.

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Book
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Conference
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El-Bayoumt, M.A.
Michigan State Univ., East Lansing (USA). Dept. of Biophysics1973
Michigan State Univ., East Lansing (USA). Dept. of Biophysics1973
AbstractAbstract
No abstract available
Original Title
Photoinduced double transfer in azaindoles
Primary Subject
Source
17 May 1973; 5 p
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Report
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Agamalyan, N.R.; Karagezyan, S.M.; Kostanyan, R.B.
Izvestia Natsional'noj Akademii Nauk Armenii, Yerevan (Armenia)1993
Izvestia Natsional'noj Akademii Nauk Armenii, Yerevan (Armenia)1993
AbstractAbstract
[en] The optical spectra of PbMoO4:Er3+ single crystals at 77 and 300K are investigated, the optical transitions of Er3+ ions in the crystals are identified and the experimental scheme of Stark splitting of Er3+ ions lowest multiplets are obtained. 6 refs
Original Title
Spektroskopiya ionov Er3+ v monokristallakh molibdata svintsa
Primary Subject
Record Type
Journal Article
Journal
Izvestiya National'noj Akademii Nauk Armenii. Fizika; ISSN 1025-5613;
; CODEN IAAFF8; v. 28(4-6); p. 178-181

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Vorwerk, Christian; Hartmann, Claudia; Cocchi, Caterina; Sadoughi, Golnaz; Habisreutinger, Severin N.
National Renewable Energy Laboratory (NREL), Golden, CO (United States). Funding organisation: USDOE Office of Energy Efficiency and Renewable Energy (EERE) (United States)2018
National Renewable Energy Laboratory (NREL), Golden, CO (United States). Funding organisation: USDOE Office of Energy Efficiency and Renewable Energy (EERE) (United States)2018
AbstractAbstract
[en] In a combined theoretical and experimental work, we investigate X-ray absorption near-edge structure spectroscopy of the I L3 and the Pb M5 edges of the methylammonium lead iodide (MAPbI3) hybrid inorganic-organic perovskite and its binary phase PbI2. The absorption onsets are dominated by bound excitons with sizable binding energies of a few hundred millielectronvolts and pronounced anisotropy. The spectra of both materials exhibit remarkable similarities, suggesting that the fingerprints of core excitations in MAPbI3 are essentially given by its inorganic component, with negligible influence from the organic groups. Furthermore, the theoretical analysis complementing experimental observations provides the conceptual insights required for a full characterization of this complex material.
Primary Subject
Source
NREL/JA--5900-71280; OSTIID--1432605; AC36-08GO28308; Available from https://www.osti.gov/pages/biblio/1432605; DOE Accepted Manuscript full text, or the publishers Best Available Version will be available free of charge after the embargo period; arXiv:1802.09726
Record Type
Journal Article
Journal
Journal of Physical Chemistry Letters; ISSN 1948-7185;
; v. 9(8); p. 1852-1858

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External URLExternal URL
AbstractAbstract
No abstract available
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Journal Article
Journal
Astrophysical Journal; v. 183(2); p. 691-699
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AbstractAbstract
No abstract available
Original Title
Etude spectroscopique de quelques galaxies compactes
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Journal Article
Journal
Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences. Serie B; v. 278(10); p. 429-431
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AbstractAbstract
[en] The A and B bands of calcium hydride are identified at high dispersion in the SC star, UY Cen. In the SC stars, the B band is largely responsible for the lambda 6379 absorption noted by Rybski (1973). CaH is also present in the CS star TT Cen, but may not be responsible for the lambda 6379 absorption in WZ Cas. (U.S.)
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Journal Article
Journal
Publications of the Astronomical Society of the Pacific; v. 87(517); p. 397-400
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AbstractAbstract
[en] The reliability of identifications of narrow absorption lines with small red shifts is analyzed statistically on the basis of literature data on spectra with high spectral resolution for 38 quasi-stellar objects. The identifications were made using a reference spectrum including the most pronounced lines of the interstellar medium. Particular attention is devoted to the case of quasi-stellar objects in the region + or - 10 deg from the supergalactic equator or coincident in position on the celestial sphere with high-latitude high-velocity hydrogen clouds, and also situated at small angular distances from nearby galaxies. It is shown that in the majority of cases identifications with the line pairs of Ca II and Na I are random
Primary Subject
Source
Cover-to-cover translation of Astrofizika (USSR).
Record Type
Journal Article
Journal
Astrophysics (Engl. Transl.); ISSN 0004-6396;
; v. 19(3); p. 250-257

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