Confirming a Predicted Selection Rule in Inelastic Neutron Scattering Spectroscopy: The Quantum Translator-Rotator H2 Entrapped Inside C60

Minzhong Xu, Mónica Jiménez-Ruiz, Mark R. Johnson, Stéphane Rols, Shufeng Ye, Marina Carravetta, Mark S. Denning, Xuegong Lei, Zlatko Bačić, Anthony J. Horsewill

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Abstract

We report an inelastic neutron scattering (INS) study of a H2 molecule encapsulated inside the fullerene C60 which confirms the recently predicted selection rule, the first to be established for the INS spectroscopy of aperiodic, discrete molecular compounds. Several transitions from the ground state of para-H2 to certain excited translation-rotation states, forbidden according to the selection rule, are systematically absent from the INS spectra, thus validating the selection rule with a high degree of confidence. Its confirmation sets a precedent, as it runs counter to the widely held view that the INS spectroscopy of molecular compounds is not subject to any selection rules.

Original languageEnglish (US)
Article number123001
JournalPhysical Review Letters
Volume113
Issue number12
DOIs
StatePublished - Sep 17 2014

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Xu, M., Jiménez-Ruiz, M., Johnson, M. R., Rols, S., Ye, S., Carravetta, M., Denning, M. S., Lei, X., Bačić, Z., & Horsewill, A. J. (2014). Confirming a Predicted Selection Rule in Inelastic Neutron Scattering Spectroscopy: The Quantum Translator-Rotator H2 Entrapped Inside C60. Physical Review Letters, 113(12), [123001]. https://doi.org/10.1103/PhysRevLett.113.123001