Doublet splitting in hydrocarbon ions due to spin-orbit interaction arising from electron circulation around the ring has been calculated using a free electron model.

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University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Free‐Electron Model and Doublet Splitting in Aromatic Hydrocarbon Ions

The Journal of Chemical Physics

Using a three dimensional free‐electron model for the π‐electron system the energies of the various singly and doubly excited configurations of benzene have been calculated. It has been found that the energies of the various singly excited configurations are in good agreement with the values obtained by Craig; whereas the energies of the doubly excited configurations are higher than those obtained by Craig. Therefore the configurational mixing for the doubly excited configurations is not necessary in this kind of model. Copyright © 1969 John Wiley & Sons, Inc.

International Journal of Quantum Chemistry

Freeâ€electron model for electronic spectra of benzene

Using the free‐electron model the triplet‐state lifetime of benzene for the 330 mμ band has been estimated to be about 36 sec, which compares favourably with the corrected experimental value of 30 sec. It has also been established that the perturbing singlet must be a π‐σ singlet rather than a π‐π singlet. Copyright © 1968 John Wiley & Sons, Inc.

Freeâ€electron model and tripletâ€state lifetime of benzene

Using a free‐electron wave function the cross section for the excitation of the first excited state and that for the ionization of benzene in the inelastic collision with fast electrons have been estimated. In the ionization process the cross section has been found to be maximum when the secondary electron moves away with a kinetic energy of about 3 eV. For incident‐electron energy above 20 eV the cross section for ionization is larger than that for excitation, while below it the reverse is the case. Copyright © 1967 John Wiley & Sons, Inc.

Freeâ€electron model for the inelastic collision of fast electrons with benzene

Using a free electron model for the π-electron system in aromatic hydrocarbons the π- electron susceptibility due to Langevin diamagnetism and Van Vleck High frequency para-magnetism (H. F.) have been calculated. The H. F. term has been found to increase rapidly with the ring size. © 1965 Springer-Verlag.

Journal	The Journal of Chemical Physics
Publisher	-
ISSN	0021-9606
Open Access	No