Photochemistry of single particles using acoustic levitation coupled with Raman microspectrometry

Tobon, Y.; Seng, Samantha; Picone, A. Lorena; Bava, Yanina B.; Juncal, Luciana C.; Moreau, Myriam; Romano, Rosana M.; Barbillat, J.; Sobanska, Sophie

doi:10.1002/jrs.5181

Cited by 18 publications

(29 citation statements)

References 24 publications

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“…The gasphase products were investigated by proton transfer reaction mass spectrometry using a commercial SRI-PTR- sample as an impurity since we did not purify the sample before experiments. As shown in the preliminary results, 17 in Figure 1, before irradiation, oxidation of MTG to its disulphide derivative was evidenced by the growth of the S-S stretching mode around 510 cm -1 , accompanied by the disappearance of the band near to 2568 cm -1 , belonging to the S-H stretching mode of the MTG. The chemical transformation occurred simultaneously with the decrease in the size of the droplet from 70 µm to 38 µm, revealed by the optical images (See Figure S1 of the Supporting Information).…”

Section: Air/aqueous Interface Experimentssupporting

confidence: 54%

“…Alternatively, as it is reported in our previous work, 17 when a particle is irradiated with a 325-nm laser, a very quick transformation is observed on the Raman spectra, with the simultaneous appearance of bands attributed to sulphate (SO 4 2 ) centred at 618 and 976 cm -1 , 29 to be faster using laser irradiation than in the broadband experiments, with an uncorrected k 2 ' at 0.28 min -1 that belongs to a lifetime (τ') of 3.6 min. The 325-nm laser provided higher energy and local photon flux density from a unique wavenumber than broadband UV-lamp, which produced local transformation on the droplet surface.…”

Section: Air/aqueous Interface Experimentsmentioning

confidence: 53%

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Photodegradation of methyl thioglycolate particles as a proxy for organosulphur containing droplets

Seng

Picone

Bava

et al. 2018

Phys. Chem. Chem. Phys.

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Understanding the formation and transformation of sulphur-rich particles is of prime importance since they contribute to the global atmospheric sulphur budget. In this work, we performed a series of experiments on a photoactive organosulphur compound namely, methyl thioglycolate, as a model of an organosulphur species of marine origin. By investigating the photoproducts within levitated droplets, we showed that elemental sulphur (α-S8) and sulphate (SO42-) can be photochemically generated at the gas-liquid interface by heterogeneous interaction with gaseous O2 and H2O. These results demonstrate that the surface of levitated droplets facilitate the oxidation of methyl thioglycolate in the dark, while illumination is necessary to produce the oxidation in bulk experiments.

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Section: Air/aqueous Interface Experimentssupporting

confidence: 54%

Section: Air/aqueous Interface Experimentsmentioning

confidence: 53%

Photodegradation of methyl thioglycolate particles as a proxy for organosulphur containing droplets

Seng

Picone

Bava

et al. 2018

Phys. Chem. Chem. Phys.

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“…The that was interpreted by the aid of TD-DFT calculations as arising mainly from n → π* transitions localized at the C=O groups. These transitions may be the responsible for the rich photochemistry of DTG as observed in levitation conditions [1].…”

Section: Resultsmentioning

confidence: 96%

“…Recently, dimethyl dithiodiglycolate (DTG), [CH 3 OC(O)CH 2 S] 2 , was proposed to be formed from methyl thioglycolate (MTG), CH 3 OC(O)CH 2 SH, in levitated microdroplets exposed to ambient air [1]. DTG was first reported in Ref.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical investigation on conformational and spectroscopic properties of dimethyl dithiodiglycolate, [CH 3 OC(O)CH 2 S] 2

Juncal

Bava

Tamone

et al. 2017

Journal of Molecular Structure

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Dimethyl dithiodiglycolate (DTG), [CH 3 OC(O)CH 2 S] 2 , was synthetized by complete oxidation of methyl thioglycolate (MTG) with I 2 , and characterized by gas chromatography coupled with electron-impact mass spectrometry. Fifteen stable conformers were found with the B3LYP/6-31+G* approximation, with calculated populations at ambient temperature higher than 1 %. The IR and Raman spectra of liquid DTG were interpreted for the first time, in terms of equilibrium between four conformers. The UV-visible spectra of DTG in solutions of ethanol, isopropanol and acetonitrile present a low-intensity band around 230 nm, interpreted mainly as arising from n → π* transitions localized at the C=O groups, according to the prediction of TD-DFT calculations.

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“…Tobon et al described the photochemistry of single particles using acoustic levitation, coupled with Raman microspectrometry. Both inorganic and organic single‐particle phototransformation has been investigated without any surface contact, and Raman microspectrometry has suitably provided the identification, the chemical heterogeneity, as well as the formation rates of products . Vogel et al have characterized phosphorus compounds in soils by deep ultraviolet Raman microspectroscopy.…”

Section: Raman Techniques and Methodsmentioning

confidence: 99%

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

Nafie

2018

J Raman Spectroscopy

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This annual review is an overview of advances in the field of Raman spectroscopy as found in papers published in the previous calendar year in the Journal of Raman Spectroscopy (JRS), as well as in trends over the past decade across journals that have published papers important to the field of Raman spectroscopy. This information is gleaned from statistical data on article counts obtained from the Clarivate Analytic's Web of Science Core Collection by year and by subfield of Raman spectroscopy. Additional information is gleaned from presentations at the XXVI International Conference on Raman Spectroscopy (ICORS 2018) in Jeju Island, Korea in August 2018, and contributions on Raman scattering at SCIX 2018, organized by the Federation of Analytical Chemistry and Spectroscopy Societies (FACSS) in Atlanta, Georgia, USA in October 2018. Coverage is also provided for topics from the European Conference on Nonlinear Optical Spetroscopy (ECONOS 2018) held in April in Milan, Italy and GeoRaman 2018 in Catania, Italy in June. Finally, papers published in JRS in 2017 are highlighted and arranged by topics at the frontier of Raman spectroscopy. On the basis of this survey information, it is clear that Raman spectroscopy continues as in recent years as a rapidly expanding field of research across a wide range of novel disciplines and applications that provide sensitive photonic information of matter at the molecular level.

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Photochemistry of single particles using acoustic levitation coupled with Raman microspectrometry

Cited by 18 publications

References 24 publications

Photodegradation of methyl thioglycolate particles as a proxy for organosulphur containing droplets

Photodegradation of methyl thioglycolate particles as a proxy for organosulphur containing droplets

Experimental and theoretical investigation on conformational and spectroscopic properties of dimethyl dithiodiglycolate, [CH 3 OC(O)CH 2 S] 2

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

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