ESR observation of the H···H, H···D, and D···D spin-pair radicals in rare gas matrices

Knight, Lon B.; Rice, William E.; Moore, Louie; Davidson, Ernest R.
October 1995
Journal of Chemical Physics;10/1/1995, Vol. 103 Issue 13, p5275
Academic Journal
The first experimental observation of the fundamentally important spin-pair radicals, H...H, H...D, and D...D is reported. ESR (electron spin resonance) studies of rare gas matrices near 4 K containing extremely high concentrations of H and D atoms revealed the presence of these spin exchange-coupled molecules whose ESR spectra are analyzed in terms of a 3Σ electronic ground state. The observed D tensor (zero-field splitting) for a specific isotopic spin pair was surprisingly constant in all four rare gases but showed large changes among the three isotopic species. As expected, the hyperfine splitting (Aiso) for the spin-pair was observed to be one-half that of the free H or D atom. © 1995 American Institute of Physics.


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