Laboratory Studies of Thermal and Non-thermal Processes in and on Growing Icy Grain Mantles: Peeling an Icy Onion...

Demian Marchione; Alexander Rosu-Finsen; Ali Ghith Moussa Abdulgalil; John Thrower; Victoria Frankland; Mark P. Collings; Martin R. S. McCoustra

Laboratory Studies of Thermal and Non-thermal Processes in and on Growing Icy Grain Mantles: Peeling an Icy Onion...

Demian Marchione, Alexander Rosu-Finsen, Ali Ghith Moussa Abdulgalil, John Thrower, Victoria Frankland, Mark P. Collings, Martin R. S. McCoustra

Institute of Chemical Sciences

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Abstract

A synthesis observations from laboratory studies on the thermal and non-thermal physics and chemistry of dust grains as they evolve from diffuse to dense environments in the interstellar medium will be presented. We will specifically report on (1) thermal desorption and the impact of surface heterogeneity; (2) agglomeration of water (H₂O) on an amorphous silica (aSiO₂) surface; (3) highly efficient electron-promoted desorption of weakly bound adsorbates from H₂O ice surfaces; (4) photo-desorption from H₂O ice surfaces at ultraviolet wavelengths in the 200 to 300 nm range; and (5) efficient molecular hydrogen (H₂) generation from ionisation of reduced carbon-containing species. The conclusion drawn from this synthesis is that the onion model of icy grain mantles needs revision.

Original language	English
Pages	11
Number of pages	1
Publication status	Published - 25 Jun 2018
Event	Physique et Chimie du Milieu Interstellaire 2018 - Pharo Palace, Marseille, France Duration: 25 Jun 2018 → 29 Jun 2018 https://pcmimarseille18.sciencesconf.org/

Conference

Conference	Physique et Chimie du Milieu Interstellaire 2018
Abbreviated title	PCMI-2018
Country/Territory	France
City	Marseille
Period	25/06/18 → 29/06/18
Internet address	https://pcmimarseille18.sciencesconf.org/

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PCMI 2018_Peeling the Icy Onion

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title = "Laboratory Studies of Thermal and Non-thermal Processes in and on Growing Icy Grain Mantles: Peeling an Icy Onion... ",

abstract = "A synthesis observations from laboratory studies on the thermal and non-thermal physics and chemistry of dust grains as they evolve from diffuse to dense environments in the interstellar medium will be presented. We will specifically report on (1) thermal desorption and the impact of surface heterogeneity; (2) agglomeration of water (H2O) on an amorphous silica (aSiO2) surface; (3) highly efficient electron-promoted desorption of weakly bound adsorbates from H2O ice surfaces; (4) photo-desorption from H2O ice surfaces at ultraviolet wavelengths in the 200 to 300 nm range; and (5) efficient molecular hydrogen (H2) generation from ionisation of reduced carbon-containing species. The conclusion drawn from this synthesis is that the onion model of icy grain mantles needs revision.",

author = "Demian Marchione and Alexander Rosu-Finsen and Abdulgalil, {Ali Ghith Moussa} and John Thrower and Victoria Frankland and Collings, {Mark P.} and McCoustra, {Martin R. S.}",

year = "2018",

month = jun,

day = "25",

language = "English",

pages = "11",

note = "Physique et Chimie du Milieu Interstellaire 2018, PCMI-2018 ; Conference date: 25-06-2018 Through 29-06-2018",

url = "https://pcmimarseille18.sciencesconf.org/",

}

TY - CONF

T1 - Laboratory Studies of Thermal and Non-thermal Processes in and on Growing Icy Grain Mantles

T2 - Physique et Chimie du Milieu Interstellaire 2018

AU - Marchione, Demian

AU - Rosu-Finsen, Alexander

AU - Abdulgalil, Ali Ghith Moussa

AU - Thrower, John

AU - Frankland, Victoria

AU - Collings, Mark P.

AU - McCoustra, Martin R. S.

PY - 2018/6/25

Y1 - 2018/6/25

N2 - A synthesis observations from laboratory studies on the thermal and non-thermal physics and chemistry of dust grains as they evolve from diffuse to dense environments in the interstellar medium will be presented. We will specifically report on (1) thermal desorption and the impact of surface heterogeneity; (2) agglomeration of water (H2O) on an amorphous silica (aSiO2) surface; (3) highly efficient electron-promoted desorption of weakly bound adsorbates from H2O ice surfaces; (4) photo-desorption from H2O ice surfaces at ultraviolet wavelengths in the 200 to 300 nm range; and (5) efficient molecular hydrogen (H2) generation from ionisation of reduced carbon-containing species. The conclusion drawn from this synthesis is that the onion model of icy grain mantles needs revision.

AB - A synthesis observations from laboratory studies on the thermal and non-thermal physics and chemistry of dust grains as they evolve from diffuse to dense environments in the interstellar medium will be presented. We will specifically report on (1) thermal desorption and the impact of surface heterogeneity; (2) agglomeration of water (H2O) on an amorphous silica (aSiO2) surface; (3) highly efficient electron-promoted desorption of weakly bound adsorbates from H2O ice surfaces; (4) photo-desorption from H2O ice surfaces at ultraviolet wavelengths in the 200 to 300 nm range; and (5) efficient molecular hydrogen (H2) generation from ionisation of reduced carbon-containing species. The conclusion drawn from this synthesis is that the onion model of icy grain mantles needs revision.

M3 - Paper

SP - 11

Y2 - 25 June 2018 through 29 June 2018

ER -

Laboratory Studies of Thermal and Non-thermal Processes in and on Growing Icy Grain Mantles: Peeling an Icy Onion...

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