Results 21 to 30 of about 254,154 (222)

THz time-domain spectroscopy of mixed CO2–CH3OH interstellar ice analogs [PDF]

, 2016
The icy mantles of interstellar dust grains are the birthplaces of the primordial prebiotic molecular inventory that may eventually seed nascent solar systems and the planets and planetesimals that form therein.
Allodi, Marco A., Blake, Geoffrey A., Ioppolo, Sergio, McGuire, Brett A.   +3 more
core   +3 more sources

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, C. M. Foreman, M. Sigl, J. C. Priscu, J. R. McConnell   +4 more
doaj   +1 more source

Reductive transformation of hexavalent chromium by ferrous ions in a frozen environment: Mechanism, kinetics, and environmental implications

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, Bomi Kim, Hyun Young Chung, Anh Quoc Khuong Nguyen, Jungwon Kim, Kitae Kim   +5 more
doaj   +1 more source

CO2 Ice toward Low-luminosity, Embedded Protostars: Evidence for Episodic Mass Accretion via Chemical History [PDF]

, 2012
We present Spitzer IRS spectroscopy of CO2 ice bending mode spectra at 15.2 micrometer toward 19 young stellar objects with luminosity lower than 1 Lsun (3 with luminosity lower than 0.1 Lsun). Ice on dust grain surfaces can encode the history of heating
André, Bergin, Chen, Chen, Chiar, Cook, D'Hendecourt, di Francesco, Doty, Dunham, Dunham, Dunham, Dunham, Dunham, Ehrenfreund, Enoch, Enoch, Evans, Furuya, Garrod, Gerakines, Hagen, Hansen, Houck, Hyo Jeong Kim, Ivezic, Jeong-Eun Lee, Kim, Klaus M. Pontoppidan, Knez, Larson, Lee, Lee, Masunaga, Michael M. Dunham, Neal J. Evans, Oba, Offner, Pontoppidan, Pontoppidan, Roser, Visser, Vorobyov, Vorobyov, Whittet, Young, Young, Young, Öberg   +48 more
core   +2 more sources

Effects of CO2 on H2O band profiles and band strengths in mixed H2O:CO2 ices [PDF]

, 2006
H2O is the most abundant component of astrophysical ices. In most lines of sight it is not possible to fit both the H2O 3 um stretching, the 6 um bending and the 13 um libration band intensities with a single pure H2O spectrum.
A. C. A. Boogert, Ayers, Bergin, Bernstein, Boogert, Boogert, Collings, Danten, Devlin, E. F. van Dishoeck, Ehrenfreund, G. W. Fuchs, Gerakines, Gerakines, Gerakines, Gibb, Gibb, H. J. Fraser, H. Linnartz, Hagen, Hudgins, K. I. Öberg, Keane, Knez, Murakawa, Nummelin, Palumbo, Pontoppidan, Rowland, S. E. Bisschop, Sandford, Schmitt, Schutte, Tanaka, Tso, van Thiel, Whittet, Willner   +37 more
core   +3 more sources

2D IR spectroscopy of high-pressure phases of ice [PDF]

The Journal of Chemical Physics, 2017
We present experimental and simulated 2D IR spectra of some high-pressure forms of isotope-pure D2O ice and compare the results to those of ice Ih published previously [F. Perakis and P. Hamm, Phys. Chem. Chem. Phys. 14, 6250 (2012); L. Shi et al., ibid. 18, 3772 (2016)]. Ice II, ice V, and ice XIII have been chosen for this study, since this selection
Tran, Halina, Cunha, Ana V, Shephard, Jacob J, Shalit, Andrey, Hamm, Peter, Jansen, Thomas L C, Salzmann, Christoph G   +6 more
openaire   +5 more sources

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, Tobias Eklund, Christina M. Tonauer, Hailong Li, Thomas Loerting, Katrin Amann-Winkel   +5 more
openaire   +3 more sources

Brief Communication: Ikaite (CaCO₃·6H₂O) discovered in Arctic sea ice [PDF]

The Cryosphere, 2010
We report for the first time on the discovery of calcium carbonate crystals as ikaite (CaCO3·6H2O) in sea ice from the Arctic (Kongsfjorden, Svalbard) as confirmed by morphology and indirectly by X-ray diffraction as well as XANES spectroscopy of ...
M. A. Granskog, S. Gerland, C. Uhlig, J. Göttlicher, G. Nehrke, G. S. Dieckmann, D. N. Thomas   +6 more
doaj   +1 more source

Accretion and photodesorption of CO ice as a function of the incident angle of deposition [PDF]

, 2019
Non-thermal desorption of inter- and circum-stellar ice mantles on dust grains, in particular ultraviolet photon-induced desorption, has gained importance in recent years.
Aparicio, S., Carrascosa de Lucas, H., Cazaux, S., Chen, Y.-J., González Díaz, C., Hsiao, L.-C., Munoz Caro, G.M., Sie, N.-E.   +7 more
core   +3 more sources

Investigation of HNCO isomers formation in ice mantles by UV and thermal processing: an experimental approach [PDF]

, 2014
Current gas phase models do not account for the abundances of HNCO isomers detected in various environments, suggesting a formation in icy grain mantles.
Caro, G. M. Muñoz, Cernicharo, J., Giuliano, B. M., Jiménez-Escobar, A., Marcelino, N.   +4 more
core   +1 more source