Results 21 to 30 of about 260,252 (303)

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, Yoshinori Iizuka, Sumito Matoba, Teruo Aoki, Takuto Ando   +4 more
doaj   +1 more source

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, Tamami I. Mori, Itsuki Sakon, Fumihiko Usui, Ronin Wu, Takashi Shimonishi   +5 more
openaire   +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

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

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

Qualitative observation of reversible phase change in astrochemical ethanethiol ices using infrared spectroscopy [PDF]

, 2016
Here we report the first evidence for a reversible phase change in an ethanethiol ice prepared under astrochemical conditions. InfraRed (IR) spectroscopy was used to monitor the morphology of the ice using the Ssingle bondH stretching vibration, a ...
Cheng, B -M., Das, A., Gorai, P., Lo, J -I., Mason, N. J., Methikkalam, R. R. J., Pavithraa, S., Pradeep, T., Raja Sekhar, B. N., Sivaraman, B.   +9 more
core   +2 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

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, Dellago C, Macher M, Franchini C, Kresse G, Bernard J, Stern JN, Loerting T   +7 more
openaire   +3 more sources

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, Urbaneja, Miguel A., Gieren, Wolfgang, Pietrzynski, Grzegorz, Kudritzki, Rolf-Peter   +4 more
openaire   +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