Fluorescence Excitation and Dispersed Fluorescence Spectra of the First Electronic Excited (S1) State of peri-Hexabenzocoronene (C42H18) Isolated in Solid para-Hydrogen

Weber, Isabelle; Lee, Yuan-Pern

doi:10.1021/acs.jpca.4c02320

J. Phys. Chem. A

2024

DOI: 10.1021/acs.jpca.4c02320

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Fluorescence Excitation and Dispersed Fluorescence Spectra of the First Electronic Excited (S₁) State of peri-Hexabenzocoronene (C₄₂H₁₈) Isolated in Solid para-Hydrogen

Isabelle Weber,

Yuan-Pern Lee

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Cited by 2 publications

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Electronic Spectroscopy of Ovalene: Reassignment of the S₂(B_3u)– S₀(A_g) Transition

Weber,

Langner,

Witek

et al. 2024

J. Phys. Chem. Lett.

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As part of our experiments to characterize solid para-hydrogen (para-H 2 ) as a matrix host for electronic spectroscopy with potential applications in the ongoing quest for the carriers of the diffuse interstellar bands (DIB), we studied dispersed fluorescence and fluorescence excitation spectra of ovalene (C 32 H 14 ), a planar polycyclic aromatic hydrocarbon (PAH) of D 2h symmetry. Although generally in good agreement with previously reported data for jet-cooled C 32 H 14 , our results, in conjunction with quantum-chemical calculations, indicate that the observed spectral progressions are associated with the S 2 (B 3u )−S 0 (A g ) electronic transition instead of the originally assigned S 1 −S 0 transition for C 32 H 14 in a supersonic jet, and that the previously reported origin band was misassigned and should be located at ∼21050 cm −1 . The reassignment is further supported by the comparably long fluorescence lifetime of ∼1.7 μs. From an analysis of spectral features located >1600 cm −1 in the fluorescence excitation spectrum, we estimate an S 2 (B 3u )−S 3 (B 1g ) energy gap of ∼350 cm −1 .

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Electronic Spectroscopy of Ovalene: Reassignment of the S₂(B_3u)– S₀(A_g) Transition

Weber,

Langner,

Witek

et al. 2024

J. Phys. Chem. Lett.

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Unique Applications of para-Hydrogen Matrix Isolation to Spectroscopy and Astrochemistry

Weber,

Joshi,

Anderson

et al. 2024

J. Phys. Chem. Lett.

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Cryogenic solid para-hydrogen (p-H 2 ) exhibits pronounced quantum effects, enabling unique experiments that are typically not possible in noble-gas matrices. The diminished cage effect facilitates the production of free radicals via in situ photolysis or photoinduced reactions. Electron bombardment during deposition readily produces protonated and hydrogenated species, such as polycyclic aromatic hydrocarbons, that are important in astrochemistry. In addition, quantum diffusion delocalizes hydrogen atoms in solid p-H 2 , allowing efficient H atom reactions with astrochemical species and introducing new concepts in astrochemical models. Some H atom reactions display anomalous temperature behaviors, highlighting the rich chemistry in p-H 2 . The investigation on quantum diffusion of heavier atoms and molecules is also important for our understanding of the chemistry in interstellar ice. Additionally, matrix shifts of electronic transitions of polycyclic aromatic hydrocarbons in p-H 2 are less divergent than those in solid Ne such that systematic measurements in p-H 2 might help in the assignment of diffuse interstellar bands.

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Fluorescence Excitation and Dispersed Fluorescence Spectra of the First Electronic Excited (S₁) State of peri-Hexabenzocoronene (C₄₂H₁₈) Isolated in Solid para-Hydrogen

Cited by 2 publications

References 34 publications

Electronic Spectroscopy of Ovalene: Reassignment of the S₂(B_3u)– S₀(A_g) Transition

Electronic Spectroscopy of Ovalene: Reassignment of the S₂(B_3u)– S₀(A_g) Transition

Unique Applications of para-Hydrogen Matrix Isolation to Spectroscopy and Astrochemistry

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Fluorescence Excitation and Dispersed Fluorescence Spectra of the First Electronic Excited (S1) State of peri-Hexabenzocoronene (C42H18) Isolated in Solid para-Hydrogen

Cited by 2 publications

References 34 publications

Electronic Spectroscopy of Ovalene: Reassignment of the S2(B3u)– S0(Ag) Transition

Electronic Spectroscopy of Ovalene: Reassignment of the S2(B3u)– S0(Ag) Transition

Unique Applications of para-Hydrogen Matrix Isolation to Spectroscopy and Astrochemistry

Contact Info

Product

Resources

About

Fluorescence Excitation and Dispersed Fluorescence Spectra of the First Electronic Excited (S₁) State of peri-Hexabenzocoronene (C₄₂H₁₈) Isolated in Solid para-Hydrogen

Electronic Spectroscopy of Ovalene: Reassignment of the S₂(B_3u)– S₀(A_g) Transition

Electronic Spectroscopy of Ovalene: Reassignment of the S₂(B_3u)– S₀(A_g) Transition