High pressure electron spin resonance of the endohedral fullerene $^{15}\mathrm{N@C}_{60}
We measure the electron spin resonance spectrum of the endohedral fullerene molecule $^{15}\mathrm{N@C}_{60}$ at pressures ranging from atmospheric pressure to 0.25 GPa, and find that the hyperfine coupling increases linearly with pressure. We present a model based on van der Waals interactions, whi...
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Main Authors | , , , , , |
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Format | Journal Article |
Language | English |
Published |
16.12.2017
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Subjects | |
Online Access | Get full text |
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Summary: | We measure the electron spin resonance spectrum of the endohedral fullerene
molecule $^{15}\mathrm{N@C}_{60}$ at pressures ranging from atmospheric
pressure to 0.25 GPa, and find that the hyperfine coupling increases linearly
with pressure. We present a model based on van der Waals interactions, which
accounts for this increase via compression of the fullerene cage and consequent
admixture of orbitals with a larger hyperfine coupling. Combining this model
with theoretical estimates of the bulk modulus, we predict the pressure shift
and compare it to our experimental results, finding fair agreement given the
spread in estimates of the bulk modulus. The spin resonance linewidth is also
found to depend on pressure. This is explained by considering the
pressure-dependent viscosity of the solvent, which modifies the effect of
dipolar coupling between spins within fullerene clusters. |
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DOI: | 10.48550/arxiv.1712.05991 |