Isotopic Segregation of Molecular Hydrogen on Water Ice Surface at Low Temperature: Importance for Interstellar Grain Chemistry

2006 ◽  
Author(s):  
L. Amiaud ◽  
F. Dulieu ◽  
S. Baouche ◽  
J. H. Fillion ◽  
A. Momeni ◽  
...  
Keyword(s):  
Low Temperature ◽  
Molecular Hydrogen ◽  
Water Ice ◽  
Ice Surface

Isotopic segregation of molecular hydrogen on water ice surface at low temperature

2005 ◽  
Vol 404 (1-3) ◽  
pp. 187-191 ◽  
Author(s):  
F. Dulieu ◽  
L. Amiaud ◽  
S. Baouche ◽  
A. Momeni ◽  
J.-H. Fillion ◽  
...  
Keyword(s):  
Low Temperature ◽  
Molecular Hydrogen ◽  
Water Ice ◽  
Ice Surface

Influence of submonolayer sodium adsorption on the photoemission of the Cu(111)/water ice surface

2006 ◽  
Vol 125 (22) ◽  
pp. 224702 ◽  
Author(s):  
Tomas Vondrak ◽  
John M. C. Plane ◽  
Stephen R. Meech
Keyword(s):  
Water Ice ◽  
Ice Surface

Formation of Molecular Hydrogen on Amorphous Water Ice: Influence of Morphology and Ultraviolet Exposure

2002 ◽  
Vol 581 (1) ◽  
pp. 276-284 ◽  
Author(s):  
J. E. Roser ◽  
G. Manico ◽  
V. Pirronello ◽  
G. Vidali
Keyword(s):  
Molecular Hydrogen ◽  
Water Ice ◽  
Ultraviolet Exposure

Structural and Phase Transitions on Water Ice Surface Under HCl Exposure: Implication for Stratosphere Conditions

1998 ◽  
Vol 05 (01) ◽  
pp. 437-441
Author(s):  
N. M. Persiantseva ◽  
O. B. Popovicheva ◽  
T. V. Rakhimova
Keyword(s):  
Phase Transitions ◽  
Pressure Range ◽  
Phase State ◽  
Amorphous Solid ◽  
Surface Concentration ◽  
Uptake Kinetics ◽  
Water Ice ◽  
Uptake Efficiency ◽  
Ice Surface ◽  
Characteristic Values

The HCl-ice interaction has been investigated over a wide HCl pressure range of 10-7–10-4 Torr and ice temperatures 150–240 K. The Three characteristic values for HCl uptake efficiency were obtained which indicate the change of phase state and structure of the ice surface at increasing HCl pressure. The low value γ ≈ 0.1 ± 0.02 corresponds to HCl vapor interaction with pure ice and is realized at the atmosphere conditions. The value γ ≈ 0.5 ± 0.1 indicates the formation of hexahydrate HCl • 6H 2 O with increase of HCl pressure. And the largest value of γ ≈ 0.8 ± 0.1 is observed at appearance of liquid or amorphous solid 4:1 H 2O:HCl. The HCl uptake kinetics is analyzed. The flow of HCl molecules from the ice surface into the bulk is shown to play an important role in the redistribution of HCl molecules. It defines a low surface concentration of the adsorbed HCl molecules under stratospher condition at early times of interaction.

scholarly journals The composition of Europa's near-surface atmosphere

2008 ◽  
Vol 4 (S251) ◽  
pp. 327-328
Author(s):  
Mau C. Wong ◽  
Tim Cassidy ◽  
Robert E. Johnson
Keyword(s):  
Solar System ◽  
Surface Composition ◽  
Near Surface ◽  
Water Ice ◽  
Model Studies ◽  
Surface Atmosphere ◽  
Jovian Magnetosphere ◽  
Ice Surface ◽  
Geophysical Phenomenon ◽  
Inorganic Species

AbstractThe presence of an undersurface ocean renders Europa as one of the few planetary bodies in our Solar System that has been conjectured to have possibly harbored life. Some of the organic and inorganic species present in the ocean underneath are expected to transport upwards through the relatively thin ice crust and manifest themselves as impurities of the water ice surface. For this reason, together with its unique dynamic atmosphere and geological features, Europa has attracted strong scientific interests in past decades.Europa is imbedded inside the Jovian magnetosphere, and, therefore, is constantly subjected to the immerse surrounding radiations, similar to the other three Galilean satellites. The magnetosphere-atmosphere-surface interactions form a complex system that provides a multitude of interesting geophysical phenomenon that is unique in the Solar System. The atmosphere of Europa is thought to have created by, mostly, charged particles sputtering of surface materials. Consequently, the study of Europa's atmosphere can be used as a tool to infer the surface composition. In this paper, we will discuss our recent model studies of Europa's near-surface atmosphere. In particular, the abundances and distributions of the dominant O2 and H2O species, and of other organic and inorganic minor species will be addressed.

scholarly journals Investigation of acoustic fields in the arctic zone with uneven ice cover

2021 ◽  
Vol 254 ◽  
pp. 02007
Author(s):  
Vladimir Korochentsev ◽  
Сhen Wenjian ◽  
Victor Petrosyants ◽  
Tatiana Lobova ◽  
Julia Shpak
Keyword(s):  
Wave Propagation ◽  
Acoustic Waves ◽  
Signal Propagation ◽  
Ice Cover ◽  
Measuring System ◽  
The Arctic ◽  
Water Medium ◽  
Water Ice ◽  
Ice Surface ◽  
Hydraulic Generator

A mathematical model for elastic wave propagation in an ice cover with uneven relief (hummock) has been developed. The theoretical model is based on the application of “directed” Green’s functions. We obtained numerical results for different distances between radiating and receiving antennas installed inside the ice layer and in water medium. An information-measuring system was created to investigate elastic acoustic waves along ice surface based on electo-hydraulic generator. Experiments of high-frequency acoustic signal propagation from electro-hydraulic generator in water-ice-air system were carried out. We illustrated the model validity for the investigation of hydroacoustic wave propagation in real ice conditions.

scholarly journals Low temperature conversion of levulinic acid into γ-valerolactone using Zn to generate hydrogen from water and nickel catalysts supported on sepiolite

RSC Advances ◽  
2020 ◽  
Vol 10 (35) ◽  
pp. 20395-20404
Author(s):  
Adrián García ◽  
Rut Sanchis ◽  
Pablo J. Miguel ◽  
Ana M. Dejoz ◽  
María Pilar Pico ◽  
...  
Keyword(s):  
Low Temperature ◽  
Molecular Hydrogen ◽  
Levulinic Acid ◽  
Nickel Catalysts ◽  
Hydrogen Addition

Levulinic acid transformation into γ-valerolactone at 30 °C in water without molecular hydrogen addition.

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