Molecular photodissociation in the vacuum ultraviolet region: implications for astrochemistry and planetary atmospheric chemistry

Gao, Hong

doi:10.1080/00268976.2020.1861354

Cited by 10 publications

(4 citation statements)

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“…Other than the two electronic states described above accessed in the UV region, our knowledge of the photoabsorption and photodissociation properties of C 2 in the vacuum ultraviolet (VUV) region between the lowest dissociation and ionization thresholds is still largely blank, as shown in Figure . Short-wavelength VUV radiation is ubiquitous in the universe, and the photodissociation of small molecules in the VUV region plays an important role in astrochemistry and planetary atmospheric chemistry. − …”

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confidence: 99%

A New Band System of the Dicarbon Molecule in the Vacuum Ultraviolet Region

Yin

Cheng

et al. 2022

J. Phys. Chem. Lett.

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As one of the most abundant molecules in the universe, the long history of spectroscopic studies of the dicarbon molecule, C 2 , reaches back two centuries. While many electronic band systems with upper states below the lowest dissociation threshold have been well characterized, much less is known about transitions to higher-lying states. Here, we report the observation of a new band system of C 2 from the lowest triplet state a 3 Π u through a resonance-enhanced multiphoton ionization scheme. The upper state is identified as 1 3 Σ g + , which is determined to be 61539.0 cm −1 (7.630 eV) above ground state X 1 Σ g + . The spectroscopic parameters determined for the 1 3 Σ g + state are in excellent agreement with those predicted by the high-level ab initio calculations. This study paves the way for systematic investigations of the photoabsorption and photodissociation of C 2 in the vacuum ultraviolet region, which has important applications in the field of astrochemistry.

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A New Band System of the Dicarbon Molecule in the Vacuum Ultraviolet Region

Yin

Cheng

et al. 2022

J. Phys. Chem. Lett.

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“…As follows from Refs. [63,88,89], the photodissociation (absorption) cross-section of ethane is close to that of methane and both free and selftrapped excitons fall into the range of ethane absorption. There are a number of primary dissociation channels which include reactions: C 2 H 6 + hν → CH 3 + CH 3 and C 2 H 6 + hν → CH 3 * + CH 3 [88].…”

Section: Resultsmentioning

confidence: 76%

Matrix-Assisted Processes in CH4-Doped Ar Ices Irradiated with an Electron Beam

Bludov,

Khyzhniy,

Uyutnov

et al. 2023

Methane

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The relaxation processes induced by exposure of the Ar matrices doped with CH4 (0.1–10%) to an electron beam were studied with a focus on the dynamics of radiolysis products—H atoms, H2 molecules, CH radicals, and energy transfer processes. Three channels of energy transfer to dopant and radiolysis products were discussed, including free charge carriers, free excitons and photons from the “intrinsic source” provided by the emission of the self-trapped excitons. Radiolysis products along with the total yield of desorbing particles were monitored in a correlated manner. Analysis of methane transformation reactions induced by free excitons showed that the CH radical can be considered a marker of the CH3 species. The competition between exciton self-trapping and energy transfer to the dopant and radiolysis products has been demonstrated. A nonlinear concentration behavior of the H atoms in doped Ar matrices has been established. Real-time correlated monitoring of optical emissions (H atom and CH3 radicals), particle ejection, and temperature revealed a nonmonotonic behavior of optical yields with a strong luminescence flash after almost an hour of exposure, which correlated with the explosive pulse of particle ejection and temperature. The connection of this phenomenon with the processes of energy transfer and recombination reactions has been established. It is shown that the delayed explosive ejection of particles is driven by both the recombination of H atoms and CH3 radicals. This occurs after their accumulation to a critical concentration in matrices at a CH4 content C ≥ 1%.

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“…High-energy photons are known as the ideal initiators of chemical reactions and effective tools for analyzing the physical and chemical properties of small molecules. 11–13 In previous studies, the photolysis of CO 2 was conducted using a 146 nm Kr 2 excimer lamp as the light source, validating the availability of high-energy photons for CO 2 transformation; however, the product yield was low. 14 Nevertheless, the direct application of high-energy photons to drive CO 2 hydrogenation may further increase the yield but still remains relatively uncharted.…”

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confidence: 99%

Catalyst-free photochemical CO₂ hydrogenation to CO and CH₄ conversion to C₂H₆

Zhai,

Zhou,

et al. 2024

Green Chem.

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Molecular photodissociation in the vacuum ultraviolet region: implications for astrochemistry and planetary atmospheric chemistry

Cited by 10 publications

References 95 publications

A New Band System of the Dicarbon Molecule in the Vacuum Ultraviolet Region

A New Band System of the Dicarbon Molecule in the Vacuum Ultraviolet Region

Matrix-Assisted Processes in CH4-Doped Ar Ices Irradiated with an Electron Beam

Catalyst-free photochemical CO₂ hydrogenation to CO and CH₄ conversion to C₂H₆

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Molecular photodissociation in the vacuum ultraviolet region: implications for astrochemistry and planetary atmospheric chemistry

Cited by 10 publications

References 95 publications

A New Band System of the Dicarbon Molecule in the Vacuum Ultraviolet Region

A New Band System of the Dicarbon Molecule in the Vacuum Ultraviolet Region

Matrix-Assisted Processes in CH4-Doped Ar Ices Irradiated with an Electron Beam

Catalyst-free photochemical CO2 hydrogenation to CO and CH4 conversion to C2H6

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Catalyst-free photochemical CO₂ hydrogenation to CO and CH₄ conversion to C₂H₆