Results 21 to 30 of about 91,395 (262)
VLT Spectroscopy of Blue Supergiants in IC 1613 [PDF]
The Astrophysical Journal, 2007 We present multi-object spectroscopy of young, massive stars in the Local Group galaxy IC 1613. We provide the spectral classification and a detailed spectral catalog for 54 OBA stars in this galaxy. The majority of the photometrically selected sample is composed of B- and A-type supergiants. The remaining stars include early O-type dwarfs and the only
Bresolin, Fabio +4 more
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Fluctuation spectroscopy of surface melting of ice with and without impurities [PDF]
Physical Review E, 2019 Water, in its three phases, is ubiquitous, and the surface properties of ice is important to clarifying the process of melting, as well as to various other fields, including geophysics. As such, the subject has been studied both theoretically and experimentally, for over a hundred years, while being an active field of research today.
Mitsui, Takahisa, Aoki, Kenichiro
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Infrared Spectroscopy and Photochemistry of Anthracoronene in Cosmic Water Ice [PDF]
ACS Earth and Space Chemistry, 2022 We present a laboratory study of the polycyclic aromatic hydrocarbon (PAH) anthracoronene (AntCor, C36H18) in simulated interstellar ices in order to determine its possible contribution to the broad infrared absorption bands in the 5–8 μm wavelength interval.
Korsmeyer, Julie M. +4 more
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Inclusions in ice layers formed by melting and refreezing processes in a Greenland ice core
Journal of Glaciology, 2023 In recent decades, surface melting on the inland Greenland ice sheet has increased, leading to significant meltwater-refreezing in the snow and firn.
Kaoru Kawakami +4 more
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Proton Ordering of Cubic Ice Ic: Spectroscopy and Computer Simulations
The Journal of Physical Chemistry C, 2014 Several proton-disordered crystalline ice structures are known to proton order at sufficiently low temperatures, provided that the right preparation procedure is used. For cubic ice, ice Ic, however, no proton ordering has been observed so far. Here, we subject ice Ic to an experimental protocol similar to that used to proton order hexagonal ice.
Geiger P +7 more
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AKARI NIR spectroscopy of interstellar ices [PDF]
Proceedings of the International Astronomical Union, 2015 AbstractThe Infrared Camera (IRC) onboard AKARI has a near-infrared (2--5μm) spectroscopic capability with high sensitivity that allows us to study the major ice components in various objects. In particular, H2O and CO2 ice absorption features have been detected towards nearby galaxies, including several young stellar objects (YSOs) in the Large ...
Takashi Onaka +5 more
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A 21 000-year record of fluorescent organic matter markers in the WAIS Divide ice core [PDF]
Climate of the Past, 2017 Englacial ice contains a significant reservoir of organic material (OM), preserving a chronological record of materials from Earth's past. Here, we investigate if OM composition surveys in ice core research can provide paleoecological information on the ...
J. D'Andrilli +4 more
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Elastic Constants of Ice by Brillouin Spectroscopy [PDF]
Journal of Glaciology, 1980 Abstract Brillouin spectroscopy has been used to measure the adiabatic elastic constants of laboratory-grown pure monocrystalline ice Ih at – 3°C. The values obtained were (in units of 10 8 N/m 2 ): c
P. H. Gammon, H. Kiefte, M. J. Clouter
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Ecotoxicology and Environmental Safety, 2021 The transformation between hexavalent chromium (Cr6+) and trivalent chromium (Cr3+) has a significant impact on ecosystems, as Cr6+ has higher levels of toxicity than Cr3+.
Quoc Anh Nguyen +5 more
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Infrared Spectroscopy on Equilibrated High-Density Amorphous Ice
The Journal of Physical Chemistry Letters, 2022 High-density (HDA) and low-density amorphous ices (LDA) are believed to be counterparts of the high- and low-density liquid phases of water, respectively. In order to better understand how the vibrational modes change during the transition between the two solid states, we present infrared spectroscopy measurements, following the change of the decoupled
Aigerim Karina +5 more
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