DOI: 10.1063/1.431627. Negative ion properties of <i>p</i>-benzoquinone: Electron affinity and compound states

Negative ion properties of p-benzoquinone: Electron affinity and compound states

10.1063/1.431627

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Bound and excited negative ion states of para-benzoquinone (PBQ) are studied from experiments involving collisions of electrons and cesium beams with PBQ. The electron affinity of PBQ was measured to be 1.89+0.2−0.3 eV using the cesium collisional ionization technique. PBQ−(C6H4O−2) was the dominant negative ion observed following collisions of cesium beams with PBQ. Direct electron attachment to PBQ produced the fragment ions C5H4O−, C5H3O−, C4O2H−2, C2HO−, and C2H− as well as the parent C6H4O−2 ion. Our observations showed that the cross section for producing the metastable parent negative ion, C6H4O−2, peaks at 1.40±0.1 eV which is in disagreement with a previous value of 2.1 eV. Attachment of thermal electrons to PBQ at low pressure (&lt;10−4 mm Hg) was not observed. Compound negative ion states were observed to peak at 0.70, 1.35, and 1.90 eV using the SF6 scavenger technique. The energies of these compound states agree qualitatively with the energies if the manifold of unfilled π* orbitals. The long-lived state at 1.4 eV is attributed to either (a) direct attachment of the incident electron into the 2b1u orbital followed by internal conversion to the ground 2B3g of PBQ− or (b) simultaneous excitation of a core electron and attachment of the incident electron into an excited orbital (i.e., core excited Feshbach resonance) as previously suggested. Evidence is presented for the former explanation.

Bibliography

Cooper, C. D., Naff, W. T., & Compton, R. N. (1975). Negative ion properties of p-benzoquinone: Electron affinity and compound states. The Journal of Chemical Physics, 63(6), 2752â2757.

Authors 3

C. D. Cooper (first)
W. T. Naff (additional)
R. N. Compton (additional)

References 26 Referenced 122

{'key': '2024020913144553800_r1'}
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Dates

Type	When
Created	22 years, 6 months ago (Feb. 27, 2003, 3:57 p.m.)
Deposited	1 year, 6 months ago (Feb. 9, 2024, 9:04 a.m.)
Indexed	2 months, 3 weeks ago (June 5, 2025, 8:05 a.m.)
Issued	49 years, 11 months ago (Sept. 15, 1975)
Published	49 years, 11 months ago (Sept. 15, 1975)
Published Print	49 years, 11 months ago (Sept. 15, 1975)

Funders 0

None

BibTeX

@article{Cooper_1975, title={Negative ion properties of p-benzoquinone: Electron affinity and compound states}, volume={63}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.431627}, DOI={10.1063/1.431627}, number={6}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Cooper, C. D. and Naff, W. T. and Compton, R. N.}, year={1975}, month=sep, pages={2752–2757} }

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  "abstract": "<jats:p>Bound and excited negative ion states of para-benzoquinone (PBQ) are studied from experiments involving collisions of electrons and cesium beams with PBQ. The electron affinity of PBQ was measured to be 1.89+0.2\u22120.3 eV using the cesium collisional ionization technique. PBQ\u2212(C6H4O\u22122) was the dominant negative ion observed following collisions of cesium beams with PBQ. Direct electron attachment to PBQ produced the fragment ions C5H4O\u2212, C5H3O\u2212, C4O2H\u22122, C2HO\u2212, and C2H\u2212 as well as the parent C6H4O\u22122 ion. Our observations showed that the cross section for producing the metastable parent negative ion, C6H4O\u22122, peaks at 1.40\u00b10.1 eV which is in disagreement with a previous value of 2.1 eV. Attachment of thermal electrons to PBQ at low pressure (&amp;lt;10\u22124 mm Hg) was not observed. Compound negative ion states were observed to peak at 0.70, 1.35, and 1.90 eV using the SF6 scavenger technique. The energies of these compound states agree qualitatively with the energies if the manifold of unfilled \u03c0* orbitals. The long-lived state at 1.4 eV is attributed to either (a) direct attachment of the incident electron into the 2b1u orbital followed by internal conversion to the ground 2B3g of PBQ\u2212 or (b) simultaneous excitation of a core electron and attachment of the incident electron into an excited orbital (i.e., core excited Feshbach resonance) as previously suggested. Evidence is presented for the former explanation.</jats:p>",
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