Distillation Kinetics of Solid Mixtures of Hydrogen Peroxide and Water and the Isolation of Pure Hydrogen Peroxide in Ultrahigh Vacuum

Loeffler, M. J.; Teolis, B. D.; Baragiola, R. A.

doi:10.1021/jp060289s

Cited by 15 publications

(17 citation statements)

References 15 publications

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“…The experiments were conducted in ultrahigh vacuum (base pressure 10 Ϫ10 torr), as described previously (Loeffler et al 2006b). Our samples were produced by 50 keV proton irradiation of amorphous H 2 O 2 films deposited at 110 K on the gold mirror electrode of a quartz-crystal microbalance (QCM; Sack & Baragiola 1993).…”

Section: Methodsmentioning

confidence: 99%

“…Some studies along these lines were made on complex mixtures of condensed gases by measuring the thermal evolution of either the composition of the radiolyzed ice or the desorbed gases (Moore et al 1983;Allamandola et al 1988;Bahr et al 2001). Here we use a combination of measurement techniques to follow the thermal evolution of a processed ice mixture produced by ion irradiation of pure amorphous H 2 O 2 at 17 K (Loeffler et al 2006b).…”

Section: Introductionmentioning

confidence: 99%

“…The sample composition was determined by a combination of thermal desorption, infrared spectroscopy, and microbalance techniques (Loeffler et al 2006b): amorphous H 2 O (69.2%), O 2 (22%), H 2 O 2 (!6.2%), and O 3 (2.6%). No H 2 was observed (4140 cm Ϫ1 ) above the noise level.…”

Section: Introductionmentioning

confidence: 99%

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A Model Study of the Thermal Evolution of Astrophysical Ices

Loeffler

Teolis

Baragiola

2006

ApJ

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We address the question of the evolution of ices that have been exposed to radiation from stellar sources and cosmic rays. We studied in the laboratory the thermal evolution of a model ice sample: a mixture of water, hydrogen peroxide, dioxygen, and ozone produced by irradiating solid H 2 O 2 with 50 keV H ϩ at 17 K. The changes in composition and release of volatiles during warming to 200 K were monitored by infrared spectroscopy, mass spectrometry, and microbalance techniques. We find evidence for voids in the water component from the infrared bands due to dangling H bonds. The absorption from these bands increases during heating and can be observed at temperatures as high as ∼155 K. More O 2 is stored in the radiolyzed film than can be retained by codeposition of O 2 and H 2 O. This O 2 remains trapped until ∼155 K, where it desorbs in an outburst as water ice crystallizes. Warming of the ice also drastically decreases the intrinsic absorbance of O 2 by annealing defects in the ice. We also observe loss of O 3 in two stages during heating, which correlates with desorption and possibly chemical reactions with radicals stored in the ice, triggered by the temperature increase.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Model Study of the Thermal Evolution of Astrophysical Ices

Loeffler

Teolis

Baragiola

2006

ApJ

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“…Tielens and Hagen [1] [1] or by energetic processes [134][135][136][137]. The OH radicals and the O 2 molecule resulting from reaction (6) and/or (7) further lead to H 2 O via reactions (2) or (3) and (4) to (6) respectively.…”

Section: Formation Of Watermentioning

confidence: 99%

Gas-surface interactions and heterogeneous chemistry on interstellar grains analogues

Fillion

Dulieu

Romanzin

et al. 2011

EPJ Web of Conferences

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Abstract.Detailed laboratory studies and progress in surface science technique, have allowed in recent years the first experimental confirmation of surface reaction schemes, as introduced by Tielens, Hagen and Charnley [1,2]. In this paper, we review few heterogeneous processes which give routes to form elementary molecules considered as precursors for explaining the variety and richness of molecular species in the interstellar medium. Adsorption, diffusion and reaction processes are discussed. With emphasis on the experimental approaches, but also supported by theoretical developments, progresses in the understanding of the "catalytic role" of a dust grain surface in various physical conditions are described. Recent advances made on few important species (H 2 , H 2 O, CH 3 OH) are used to illustrate basic properties and raise open questions.

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“…4 Pure hydrogen peroxide is mainly used for preparation of peroxo containing crystals 5,6,7,8 and physical studies of the hydrogen peroxide. 9,10 Currently, there are three main obstacles that are limiting an even wider use of hydrogen peroxide by synthetic chemists, including university scholars, who occasionally require small quantities of hydrogen peroxide. (i) Pure hydrogen peroxide, even in laboratory-scale quantities, is commercially unavailable and its synthesis by non experts is hazardous.…”

Section: Introductionmentioning

confidence: 99%