Vacuum ultraviolet photoabsorption of pure solid ozone and its implication on the identification of ozone on Moon

Sivaraman, Bhalamurugan; Nair, B. G.; Sekhar, B. N. Raja; Lo, Jen‐Iu; Sridharan, R.; Cheng, Bing‐Ming; Mason, Nigel J.

doi:10.1016/j.cplett.2014.04.021

Cited by 14 publications

(16 citation statements)

References 24 publications

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“…Laboratory results on astrophysically relevant ices obtained in the VUV spectral range are equally sparse. To our knowledge, most VUV spectroscopic studies of ices have explored pure molecules or simple mixtures (e.g., Mason et al 2006;Sivaraman et al 2014;Cruz-Diaz et al 2014a,b;Wu et al 2012;Lo et al 2018Lo et al , 2019Chou et al 2020), and there have been only a few VUV photoabsorption studies of electron-irradiated ices in the spectral range 100 − 200 nm (Wu et al 2013a,b).…”

Section: Introductionmentioning

confidence: 99%

Vacuum ultraviolet photoabsorption spectroscopy of space-related ices: 1 keV electron irradiation of nitrogen- and oxygen-rich ices

Ioppolo

Kaňuchová

James

et al. 2020

A&A

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Context. Molecular oxygen, nitrogen, and ozone have been detected on some satellites of Saturn and Jupiter, as well as on comets. They are also expected to be present in ice-grain mantles within star-forming regions. The continuous energetic processing of icy objects in the Solar System induces physical and chemical changes within the ice. Laboratory experiments that simulate energetic processing (ions, photons, and electrons) of ices are therefore essential for interpreting and directing future astronomical observations. Aims. We provide vacuum ultraviolet (VUV) photoabsorption spectroscopic data of energetically processed nitrogen- and oxygen-rich ices that will help to identify absorption bands and/or spectral slopes observed on icy objects in the Solar System and on ice-grain mantles of the interstellar medium. Methods. We present VUV photoabsorption spectra of frozen O2 and N2, a 1:1 mixture of both, and a new systematic set of pure and mixed nitrogen oxide ices. Spectra were obtained at 22 K before and after 1 keV electron bombardment of the ice sample. Ices were then annealed to higher temperatures to study their thermal evolution. In addition, Fourier-transform infrared spectroscopy was used as a secondary probe of molecular synthesis to better identify the physical and chemical processes at play. Results. Our VUV data show that ozone and the azide radical (N3) are observed in our experiments after electron irradiation of pure O2 and N2 ices, respectively. Energetic processing of an O2:N2 = 1:1 ice mixture leads to the formation of ozone along with a series of nitrogen oxides. The electron irradiation of solid nitrogen oxides, pure and in mixtures, induces the formation of new species such as O2, N2, and other nitrogen oxides not present in the initial ice. Results are discussed here in light of their relevance to various astrophysical environments. Finally, we show that VUV spectra of solid NO2 and water can reproduce the observational VUV profile of the cold surface of Enceladus, Dione, and Rhea, strongly suggesting the presence of nitrogen oxides on the surface of the icy Saturn moons.

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Section: Introductionmentioning

confidence: 99%

Vacuum ultraviolet photoabsorption spectroscopy of space-related ices: 1 keV electron irradiation of nitrogen- and oxygen-rich ices

Ioppolo

Kaňuchová

James

et al. 2020

A&A

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“…Indeed, the evidence for the presence of CS 2 was found in the data sent by the Chandra's Altitudinal Composition Explorer (CHACE) instrument on MIP17 where mass of 76 amu corresponding to CS 2 was found at ∼9×10 −13 Torr (partial pressure) in the exosphere at the Lunar south pole (figure 3). In fact, the ChACE instrument on MIP was used to confirm minor chemical constituents such as O 3 ,18 which is also a product observed in the present study. Owing to the larger abundances of SO 2 molecules, there could be several other pathways synthesizing SO 2 via other sulphur bearing molecules such as H 2 S, however, the reaction channels from S atoms originating from the Partial pressure (in Torr) for mass of 76 amu, 64 amu and 44 amu corresponding to CS 2 , SO 2 , and CO 2 , respectively, in the Lunar south pole observed by the CHACE on MIP.…”

mentioning

confidence: 60%

“…Owing to the larger abundances of SO 2 molecules, there could be several other pathways synthesizing SO 2 via other sulphur bearing molecules such as H 2 S, however, the reaction channels from S atoms originating from the Partial pressure (in Torr) for mass of 76 amu, 64 amu and 44 amu corresponding to CS 2 , SO 2 , and CO 2 , respectively, in the Lunar south pole observed by the CHACE on MIP. Data on CO 2 and SO 2 are adapted from Sivaraman et al18…”

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confidence: 99%

Electron irradiation of carbon dioxide-carbon disulphide ice analog and its implication on the identification of carbon disulphide on Moon

Sivaraman

2016

J Chem Sci

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Carbon dioxide (CO 2) and carbon disulphide (CS 2) molecular ice mixture was prepared under low temperature (85 K) astrochemical conditions. The icy mixture irradiated with keV electrons simulates the irradiation environment experienced by icy satellites and Interstellar Icy Mantles (IIM). Upon electron irradiation the chemical composition was found to have altered and the new products from irradiation were found to be carbonyl sulphide (OCS), sulphur dioxide (SO 2), ozone (O 3), carbon trioxide (CO 3), sulphur trioxide (SO 3), carbon subsulphide (C 3 S 2) and carbon monoxide (CO). Results obtained confirm the presence of CS 2 molecules in lunar south-pole probed by the Moon Impact Probe (MIP).

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“…Research on ozone (O 3 ) is evergreen as it is an important molecular entity in stratosphere, preventing the harmful UV radiation to reach earth's surface . The importance of photo oxidation via O 3 also stems from the fact that it is considered as a biomarker for planetary lives ,. The studies on O 3 in the laboratory are always fascinating in terms of astrochemical, environmental and even in general chemistry view point due to the rich structural information it offers in understanding the photo induced processes …”

Section: Introductionmentioning

confidence: 99%

Photolysis of PCl₃/POCl₃ with Oxygen Dopant Using 193 nm ArF Excimer at Low Temperatures: Oxygen Insertion through ‘Phosphadioxirane’ Pathway

et al. 2019

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Photolysis was performed on PCl 3 and POCl 3 in the presence of oxygen dopant in Ar matrix at low temperatures using 193 nm ArF excimer laser. The photo irradiation initially facilitated the formation of ozone in situ in the low temperature matrix. For PCl 3 + O 2 photolysis with 193 nm ArF excimer, initially POCl 3 was produced and subsequent oxygen atom insertion on POCl 3 generated PO 2 Cl 3 . Furthermore, secondary reaction channel opens up in PCl 3 + O 2 photolysis to form a variety of photoproducts such as POCl, P III O 2 Cl, P V O 2 Cl and PO 3 Cl. The insertion of oxygen atom on POCl through phosphadioxirane intermediate generated P III O 2 Cl and the direct oxygen atom addition resulted in P V O 2 Cl. A successive oxygen insertion on P V O 2 Cl triggered the PO 3 Cl generation. The identification of all the photoproducts was confirmed through 18 O 2 isotopic experiments and quantum chemical computations performed using density functional theory (DFT). Computations carried out at B3LYP level of theory with 6-311 + + G(d,p) basis set were used to correlate the structure of photo products obtained experimentally. Interestingly, photo irradiation of POCl 3 with oxygen dopant in Ar matrix @193 nm ArF excimer resulted in the generation of PO 2 Cl 3 , PO 3 Cl 3 and PO 4 Cl 3 photo products by a sequential insertion of oxygen atoms through phosphadioxirane intermediate. A compelling evidence for the passage of the reaction through phosphadioxirane intermediate is established through 18 O 2 isotopic substitution experiments.

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Vacuum ultraviolet photoabsorption of pure solid ozone and its implication on the identification of ozone on Moon

Cited by 14 publications

References 24 publications

Vacuum ultraviolet photoabsorption spectroscopy of space-related ices: 1 keV electron irradiation of nitrogen- and oxygen-rich ices

Vacuum ultraviolet photoabsorption spectroscopy of space-related ices: 1 keV electron irradiation of nitrogen- and oxygen-rich ices

Electron irradiation of carbon dioxide-carbon disulphide ice analog and its implication on the identification of carbon disulphide on Moon

Photolysis of PCl₃/POCl₃ with Oxygen Dopant Using 193 nm ArF Excimer at Low Temperatures: Oxygen Insertion through ‘Phosphadioxirane’ Pathway

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Vacuum ultraviolet photoabsorption of pure solid ozone and its implication on the identification of ozone on Moon

Cited by 14 publications

References 24 publications

Vacuum ultraviolet photoabsorption spectroscopy of space-related ices: 1 keV electron irradiation of nitrogen- and oxygen-rich ices

Vacuum ultraviolet photoabsorption spectroscopy of space-related ices: 1 keV electron irradiation of nitrogen- and oxygen-rich ices

Electron irradiation of carbon dioxide-carbon disulphide ice analog and its implication on the identification of carbon disulphide on Moon

Photolysis of PCl3/POCl3 with Oxygen Dopant Using 193 nm ArF Excimer at Low Temperatures: Oxygen Insertion through ‘Phosphadioxirane’ Pathway

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Photolysis of PCl₃/POCl₃ with Oxygen Dopant Using 193 nm ArF Excimer at Low Temperatures: Oxygen Insertion through ‘Phosphadioxirane’ Pathway