Adsorbate-induced changes in the structure of amorphous thin films of ice

2003 ◽  
Vol 81 (1-2) ◽  
pp. 167-174 ◽  
Author(s):  
P Swiderek
Keyword(s):  
Film Growth ◽  
Band System ◽  
Vibrational Modes ◽  
Amorphous Thin Films ◽  
Amorphous Ice ◽  
Ice Surface ◽  
Ice Films ◽  
Reflection Absorption Infrared Spectroscopy ◽  
Uppermost Layer ◽  
Induced Changes

The effect of adsorption of thiophene on the infrared spectra of thin amorphous ice films deposited on Pt(111) is studied using reflection-absorption infrared spectroscopy (RAIRS). The changes within the RAIR spectra in the range of the O–H-stretching band system upon adsorption depend on the structure of the ice films and the temperature at which the thiophene is deposited. Preferred binding at the ice surface to sites that are most likely identical with dangling-H groups occurs only if adsorbate mobility is sufficiently high. Otherwise, random film growth is observed, i.e., formation of multilayer islands before the first layer of thiophene on ice is completed. The adsorbate-induced changes within the O–H-stretching band system of the ice films are different for these two situations. Binding to dangling-H sites is shown to influence more than the uppermost layer of the ice, whereas random deposition has an effect only on surface vibrational modes. PACS Nos.: 68.43Fg, 62.35Ja

Experimental and simulated vibrational spectra of H2 absorbed in amorphous ice: Surface structures, energetics, and relaxations

1992 ◽  
Vol 97 (2) ◽  
pp. 753-767 ◽  
Author(s):  
Holly G. Hixson ◽  
Marek J. Wojcik ◽  
Matthew S. Devlin ◽  
J. Paul Devlin ◽  
V. Buch
Keyword(s):  
Vibrational Spectra ◽  
Surface Structures ◽  
Amorphous Ice ◽  
Ice Surface

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

scholarly journals Reflection Absorption Infrared Spectroscopy Characterization of SAM Formation from 8-Mercapto-N-(phenethyl)octanamide Thiols with Phe Ring and Amide Groups

Molecules ◽  
2020 ◽  
Vol 25 (23) ◽  
pp. 5633
Author(s):  
Zenonas Kuodis ◽  
Ieva Matulaitienė ◽  
Marija Špandyreva ◽  
Linas Labanauskas ◽  
Sigitas Stončius ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Self Assembled Monolayers ◽  
Trans Conformation ◽  
Band Frequency ◽  
Reflection Absorption Infrared Spectroscopy ◽  
Assembled Monolayers ◽  
Vibrational Bands ◽  
Induced Changes ◽  
Hydrogen Bonded

Multifunctional amide-containing self-assembled monolayers (SAMs) provide prospects for the construction of interfaces with required physicochemical properties and distinctive stability. In this study, we report the synthesis of amide-containing thiols with terminal phenylalanine (Phe) ring functionality (HS(CH2)7CONH(CH2)2C6H5) and the characterization of the formation of SAMs from these thiols on gold by reflection absorption infrared spectroscopy (RAIRS). For reliable assignments of vibrational bands, ring deuterated analogs were synthesized and studied as well. Adsorption time induced changes in Amide-II band frequency and relative intensity of Amide-II/Amide-I bands revealed two-state sigmoidal form dependence with a transition inflection points at 2.2 ± 0.5 and 4.7 ± 0.5 min, respectively. The transition from initial (disordered) to final (hydrogen-bonded, ordered) structure resulted in increased Amide-II frequency from 1548 to 1557 cm−1, which is diagnostic for a strongly hydrogen-bonded amide network in trans conformation. However, the lateral interactions between the alkyl chains were found to be somewhat reduced when compared with well-ordered alkane thiol monolayers.

Experimental and Theoretical Investigation of HC5N Adsorption on Amorphous Ice Surface: Simulation of the Interstellar Chemistry

2008 ◽  
Vol 112 (35) ◽  
pp. 8024-8029 ◽  
Author(s):  
Anne Coupeaud ◽  
Nathalie Piétri ◽  
Alain Allouche ◽  
Jean-Pierre Aycard ◽  
Isabelle Couturier-Tamburelli
Keyword(s):  
Theoretical Investigation ◽  
Interstellar Chemistry ◽  
Amorphous Ice ◽  
Ice Surface

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.

Annealing of amorphous ice films

1996 ◽  
Vol 208 (1-2) ◽  
pp. 151-161 ◽  
Author(s):  
J. Hessinger ◽  
R.O. Pohl
Keyword(s):  
Amorphous Ice ◽  
Ice Films
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