Direct ionization-driven observational approaches for radical cation formation in solution for pulse radiolysis

Gohdo, Masao; Tagawa, Seiichi; Kan, Koichi; Yang, Jinfeng; Yoshida, Yoichi

doi:https://doi.org/10.1016/j.radphyschem.2022.110105

Direct ionization-driven observational approaches for radical cation formation in solution for pulse radiolysis

Gohdo, Masao; Tagawa, Seiichi; Kan, Koichi et al.

Radiation Physics and Chemistry, 2022, 196, 110105

Number of Access:567（2025-08-16 02:40 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/87650

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Title	Direct ionization-driven observational approaches for radical cation formation in solution for pulse radiolysis
Creator	NRID 1000060705094 1000060705094 ORCID 0000-0002-4773-4859 0000-0002-4773-4859 researchmap permalink gohdo gohdo Scopus Author ID 23488486900 23488486900 CreatorName Gohdo, Masao
	NRID 1000080011203 1000080011203 researchmap permalink read0121140 read0121140 CreatorName Tagawa, Seiichi
	NRID 1000060553302 1000060553302 researchmap permalink link_ link_ Scopus Author ID 10044845800 10044845800 CreatorName Kan, Koichi
	NRID 1000090362631 1000090362631 researchmap permalink read0134206 read0134206 CreatorName Yang, Jinfeng
	NRID 1000050210729 1000050210729 researchmap permalink yo-yoshida yo-yoshida Scopus Author ID 7404400372 7404400372 CreatorName Yoshida, Yoichi
Subject	Pulse radiolysis
	Direct ionization
	Transient absorption
	Radical cation observation technique
Abstract	Radical cations’ dynamics in early stage reactions in the ionizing radiation induced reaction is essential to understanding the whole reaction scheme. The observation of radical cations in tetrahydrofuran (THF) solutions was demonstrated for time-resolved measurements using pulse radiolysis. The designedly concentrated solutions enabled the observation of the direct ionization-driven radical cations. In THF, the transient absorption spectra of the biphenyl radical cations, which were generated through direct ionization of biphenyl under electron beam irradiation, were found to be associated with the biphenyl radical anions generated by the attachment of an excess electron to the biphenyl. Furthermore, when polystyrene (PS) was used as the solute in THF solutions, transient absorption spectra of the dimer radical cations containing solvated electrons of PS were observed. The findings, therefore, indicate that the time-resolution-based limitation on the radical cation-forming process observation, which was imposed by the diffusion-limited reactions of the solvent radical cations with the solute, could be overcome by employing direct ionization in THF. This method can be employed to study the reactivity of radical cations with solvents and the stability of radical cations in fluid media.
Publisher	Elsevier
Source Title	Radiation Physics and Chemistry
Volume (Issue)	196
Page	110105
Date of Issued	2022-07
Language	English
Handle URL	https://hdl.handle.net/11094/87650
PISSN	0969806X
eISSN	18790895
NCID	AA10867451
Relation.isVersionOf	DOI (Publisher Version) https://doi.org/10.1016/j.radphyschem.2022.110105
Access Rights	open access
CopyRight	© 2022. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
oaire:version	Accepted Manuscript
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Radiation Physics and Chemistry. 2022, 196, p. 110105
DC.title	Direct ionization-driven observational approaches for radical cation formation in solution for pulse radiolysis
DC.creator	Gohdo, Masao
	Tagawa, Seiichi
	Kan, Koichi
	Yang, Jinfeng
	Yoshida, Yoichi
DC.publisher	Elsevier
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2022-07
DC.identifier	https://doi.org/10.1016/j.radphyschem.2022.110105
DC.subject	Pulse radiolysis
	Direct ionization
	Transient absorption
	Radical cation observation technique
DCTERMS.abstract	Radical cations’ dynamics in early stage reactions in the ionizing radiation induced reaction is essential to understanding the whole reaction scheme. The observation of radical cations in tetrahydrofuran (THF) solutions was demonstrated for time-resolved measurements using pulse radiolysis. The designedly concentrated solutions enabled the observation of the direct ionization-driven radical cations. In THF, the transient absorption spectra of the biphenyl radical cations, which were generated through direct ionization of biphenyl under electron beam irradiation, were found to be associated with the biphenyl radical anions generated by the attachment of an excess electron to the biphenyl. Furthermore, when polystyrene (PS) was used as the solute in THF solutions, transient absorption spectra of the dimer radical cations containing solvated electrons of PS were observed. The findings, therefore, indicate that the time-resolution-based limitation on the radical cation-forming process observation, which was imposed by the diffusion-limited reactions of the solvent radical cations with the solute, could be overcome by employing direct ionization in THF. This method can be employed to study the reactivity of radical cations with solvents and the stability of radical cations in fluid media.
DC.rights	© 2022. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
DC.format	87650
citation_title	Direct ionization-driven observational approaches for radical cation formation in solution for pulse radiolysis
citation_author	Gohdo, Masao
	Tagawa, Seiichi
	Kan, Koichi
	Yang, Jinfeng
	Yoshida, Yoichi
citation_publisher	Elsevier
citation_language	English
citation_date	2022-07
citation_journal_title	Radiation Physics and Chemistry
citation_volume	196
citation_firstpage	110105
citation_doi	https://doi.org/10.1016/j.radphyschem.2022.110105
citation_public_url	https://hdl.handle.net/11094/87650

Direct ionization-driven observational approaches for radical cation formation in solution for pulse radiolysis

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