Correction: Surface heterogeneity and inhomogeneous broadening of vibrational line profiles

Taj, Skandar; Baird, Diane; Rosu-Finsen, Alexander; McCoustra, Martin R. S.

doi:10.1039/c9cp90226k

Cited by 4 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, we found that another scenario might be more attractive. Indeed, experiments on CO adsorption on water ices show the presence of a specific band at 2,152-2,153 cm −1 in the case of CO adsorption in pores compared to a band at 2,139 cm −1 for surface adsorption sites (Fraser et al, 2004;Taj et al, 2017Taj et al, , 2019. The relatively sharp band that we observed at 2,153 cm −1 might well be due to CO entrapped in the porous dust (cf.…”

Section: Dust Infrared Spectroscopymentioning

confidence: 51%

Impact of Metals on (Star)Dust Chemistry: A Laboratory Astrophysics Approach

Berard

Demyk

Simon

et al. 2021

Front. Astron. Space Sci.

View full text Add to dashboard Cite

Laboratory experiments are essential in exploring the mechanisms involved in stardust formation. One key question is how a metal is incorporated into dust for an environment rich in elements involved in stardust formation (C, H, O, Si). To address experimentally this question we have used a radiofrequency cold plasma reactor in which cyclic organosilicon dust formation is observed. Metallic (silver) atoms were injected in the plasma during the dust nucleation phase to study their incorporation in the dust. The experiments show formation of silver nanoparticles (~15 nm) under conditions in which organosilicon dust of size 200 nm or less is grown. The presence of AgSiO bonds, revealed by infrared spectroscopy, suggests the presence of junctions between the metallic nanoparticles and the organosilicon dust. Even after annealing we could not conclude on the formation of silver silicates, emphasizing that most of silver is included in the metallic nanoparticles. The molecular analysis performed by laser mass spectrometry exhibits a complex chemistry leading to a variety of molecules including large hydrocarbons and organometallic species. In order to gain insights into the involved chemical molecular pathways, the reactivity of silver atoms/ions with acetylene was studied in a laser vaporization source. Key organometallic species, AgnC2Hm (n = 1–3; m = 0–2), were identified and their structures and energetic data computed using density functional theory. This allows us to propose that molecular Ag–C seeds promote the formation of Ag clusters but also catalyze hydrocarbon growth. Throughout the article, we show how the developed methodology can be used to characterize the incorporation of metal atoms both in the molecular and dust phases. The presence of silver species in the plasma was motivated by objectives finding their application in other research fields than astrochemistry. Still, the reported methodology is a demonstration laying down the ground for future studies on metals of astrophysical interest, such as iron.

show abstract

Section: Dust Infrared Spectroscopymentioning

confidence: 51%

Impact of Metals on (Star)Dust Chemistry: A Laboratory Astrophysics Approach

Berard

Demyk

Simon

et al. 2021

Front. Astron. Space Sci.

View full text Add to dashboard Cite

show abstract

“…However we found that another scenario might be more attractive. Indeed, experiments on CO adsorption on water ices show the presence of a specific band at 2152-2153 cm −1 in the case of CO adsorption in pores compared to a band at 2139 cm −1 for surface adsorption sites (Fraser et al, 2004;Taj et al, 2017Taj et al, , 2019. The relatively sharp band that we observed at 2153 cm −1 might well be due to CO entrapped in the porous dust (cf.…”

Section: Impact Of Metals On (Star)dust Chemistrymentioning

confidence: 55%

Impact of metals on (star)dust chemistry: a laboratory astrophysics approach

Bérard,

Makasheva,

Demyk

et al. 2021

Preprint

View full text Add to dashboard Cite

Laboratory experiments are essential in exploring the mechanisms involved in stardust formation. One key question is how a metal is incorporated into dust for an environment rich in elements involved in stardust formation (C, H, O, Si). To address experimentally this question we have used a radiofrequency cold plasma reactor in which cyclic organosilicon dust formation is observed. Metallic (silver) atoms were injected in the plasma during the dust nucleation phase to study their incorporation in the dust. The experiments show formation of silver nanoparticles (∼15 nm) under conditions in which organosilicon dust of size 200 nm or less is grown. The presence of AgSiO bonds, revealed by infrared spectroscopy, suggests the presence of junctions between the metallic nanoparticles and the organosilicon dust. Even after annealing we could not conclude on the formation of silver silicates, emphasizing that most of silver is included in the metallic nanoparticles. The molecular analysis performed by laser mass spectrometry exhibits a complex chemistry leading to a variety of molecules including large hydrocarbons and organometallic species. In order to gain insights into the involved chemical molecular pathways, the reactivity of silver atoms/ions with acetylene was studied in a laser vaporization source. Key organometallic species, Ag n C 2 H m (n=1-3; m=0-2), were identified and their structures and energetic data computed using density functional theory. This allows us to propose that molecular Ag-C seeds promote the formation of Ag clusters but also catalyze hydrocarbon growth.Throughout the article, we show how the developed methodology can be used to characterize the incorporation of metal atoms both in the molecular and dust phases. The presence of silver species in the plasma was motivated by objectives finding their application in other research fields than astrochemistry. Still, the reported methodology is a demonstration laying down the ground for future studies on metals of astrophysical interest such as iron.

show abstract

“…The inversion technique of Kay and co-workers [164][165][166] has been widely adapted to describe small molecule desorption from many heterogeneous astrophysically-relevant surfaces including carbonaceous [174][175][176][177][178][179][180][181][182][183][184][185][186][187][188][189], siliceous [101,[169][170][171]181,[190][191][192][193][194][195] and ice surfaces [196,197]. But we are now beginning to see the extended inversion method of Smith et al…”

Section: Thermal Processesmentioning

confidence: 99%

Physics and chemistry on the surface of cosmic dust grains: a laboratory view

Потапов

McCoustra

2021

International Reviews in Physical Chemistry

View full text Add to dashboard Cite

Dust grains play a central role in the physics and chemistry of cosmic environments. They influence the optical and thermal properties of the medium due to their interaction with stellar radiation; provide surfaces for the chemical reactions that are responsible for the synthesis of a significant fraction of key astronomical molecules; and they are building blocks of pebbles, comets, asteroids, planetesimals, and planets. In this paper, we review experimental studies of physical and chemical processes, such as adsorption, desorption, diffusion, and reactions forming molecules, on the surface of reliable cosmic dust grain analogues as related to processes in diffuse, translucent, and dense interstellar clouds, protostellar envelopes, planetforming disks, and planetary atmospheres. The information that such experiments reveal should be flexible enough to be used in many different environments. In addition, we provide a forward look discussing new ideas, experimental approaches, and research directions.

show abstract

Correction: Surface heterogeneity and inhomogeneous broadening of vibrational line profiles

Abstract: Correction for ‘Surface heterogeneity and inhomogeneous broadening of vibrational line profiles’ by Skandar Taj et al., Phys. Chem. Chem. Phys., 2017, 19, 7990–7995.

Cited by 4 publications

References 1 publication

Impact of Metals on (Star)Dust Chemistry: A Laboratory Astrophysics Approach

Impact of Metals on (Star)Dust Chemistry: A Laboratory Astrophysics Approach

Impact of metals on (star)dust chemistry: a laboratory astrophysics approach

Physics and chemistry on the surface of cosmic dust grains: a laboratory view

Contact Info

Product

Resources

About