Interactions of CCl4with Thin D2O Amorphous Ice Films. 2. Variation of Desorption Kinetics with Ice Preparation Conditions and Evidence for Distinct Structures of Low-Density Amorphous Ice

2000 ◽  
Vol 104 (20) ◽  
pp. 4894-4902 ◽  
Author(s):  
V. Sadtchenko ◽  
K. Knutsen ◽  
C. F. Giese ◽  
W. Ronald Gentry
Keyword(s):  
Desorption Kinetics ◽  
Low Density ◽  
Amorphous Ice ◽  
Preparation Conditions ◽  
Ice Films

scholarly journals X-ray studies of the transformation from high- to low-density amorphous water

2019 ◽  
Vol 377 (2146) ◽  
pp. 20180164 ◽  
Author(s):  
Daniel Mariedahl ◽  
Fivos Perakis ◽  
Alexander Späh ◽  
Harshad Pathak ◽  
Kyung Hwan Kim ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Structural Evolution ◽  
High Energy ◽  
Real Space ◽  
High Density ◽  
Low Density ◽  
X Ray ◽  
Amorphous Ice ◽  
Density State ◽  
Amorphous States

Here we report about the structural evolution during the conversion from high-density amorphous ices at ambient pressure to the low-density state. Using high-energy X-ray diffraction, we have monitored the transformation by following in reciprocal space the structure factor S OO ( Q ) and derived in real space the pair distribution function g OO ( r ). Heating equilibrated high-density amorphous ice (eHDA) at a fast rate (4 K min –1 ), the transition to the low-density form occurs very rapidly, while domains of both high- and low-density coexist. On the other hand, the transition in the case of unannealed HDA (uHDA) and very-high-density amorphous ice is more complex and of continuous nature. The direct comparison of eHDA and uHDA indicates that the molecular structure of uHDA contains a larger amount of tetrahedral motives. The different crystallization behaviour of the derived low-density amorphous states is interpreted as emanating from increased tetrahedral coordination present in uHDA. This article is part of the theme issue ‘The physics and chemistry of ice: scaffolding across scales, from the viability of life to the formation of planets'.

Sticking Probability of High-Energy Methane on Crystalline, Amorphous, and Porous Amorphous Ice Films

2019 ◽  
Vol 123 (29) ◽  
pp. 17855-17863 ◽  
Author(s):  
Rebecca S. Thompson ◽  
Michelle R. Brann ◽  
S. J. Sibener
Keyword(s):  
High Energy ◽  
Sticking Probability ◽  
Amorphous Ice ◽  
Ice Films

Structure of high- and low-density amorphous ice

2000 ◽  
Vol 61 (1) ◽  
pp. 28-31 ◽  
Author(s):  
László Pusztai
Keyword(s):  
Low Density ◽  
Amorphous Ice

Nature of the transformations of ice I and low‐density amorphous ice to high‐density amorphous ice

1989 ◽  
Vol 91 (11) ◽  
pp. 7187-7192 ◽  
Author(s):  
M. A. Floriano ◽  
Y. P. Handa ◽  
D. D. Klug ◽  
Edward Whalley
Keyword(s):  
High Density ◽  
Low Density ◽  
Amorphous Ice

Structural Relaxation of Low-Density Amorphous Ice upon Thermal Annealing

2013 ◽  
Vol 4 (21) ◽  
pp. 3672-3676 ◽  
Author(s):  
Jacob J. Shephard ◽  
John S. O. Evans ◽  
Christoph G. Salzmann
Keyword(s):  
Thermal Annealing ◽  
Structural Relaxation ◽  
Low Density ◽  
Amorphous Ice

Nature of the transformations of ice i and low-density amorphous ice to high-density amorphous ice

1990 ◽  
Vol 4 (1-6) ◽  
pp. 396-398 ◽  
Author(s):  
M. A. Floriano ◽  
Y. P. Handa ◽  
D. D. Klug ◽  
Edward Whalley
Keyword(s):  
High Density ◽  
Low Density ◽  
Amorphous Ice

scholarly journals Trapping of HCl and oxidised organic trace gases in growing ice at temperatures relevant to cirrus clouds

2019 ◽  
Vol 19 (18) ◽  
pp. 11939-11951
Author(s):  
Matthias Kippenberger ◽  
Gerhard Schuster ◽  
Jos Lelieveld ◽  
John N. Crowley
Keyword(s):  
Formic Acid ◽  
Trace Gases ◽  
Desorption Kinetics ◽  
Phase Partitioning ◽  
Ice Growth ◽  
Ice Surface ◽  
Ice Films ◽  
Order Of Magnitude ◽  
Kinetics Of ◽  
Organic Trace

Abstract. The uptake of hydrochloric acid (HCl), ethanol (C2H5OH), 1-butanol (1-C4H9OH), formic acid HC(O)OH and trifluoroacetic (CF3C(O)OH) acid to growing ice surfaces was investigated at temperatures between 194 and 228 K. HCl displayed extensive, continuous uptake during ice growth, which was strongly dependent on the ice growth velocity, the temperature of the ice surface and the gas phase concentration of HCl. Trifluoroacetic acid was also observed to be trapped in growing ice, albeit approximately an order of magnitude less efficiently than HCl, whereas the adsorption and desorption kinetics of ethanol, 1-butanol, formic acid on ice were not measurably different to those for non-growing ice, even at very high ice growth rates. We present a parameterisation of the uptake coefficient for HCl on growing ice films (γtrap) and compare the results to an existing framework that describes the non-equilibrium trapping of trace gases on ice. The trapping of HCl in growing ice crystals in the atmosphere is assessed and compared to the gas and ice phase partitioning resulting from equilibrium surface adsorption and solubility.

Sign in / Sign up

Export Citation Format

Share Document