Journal
PHYSICAL REVIEW LETTERS
Volume 130, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.130.083001
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In this study, infrared spectroscopy is used to investigate 4HeN center dot center dot center dot H3O+ complexes. It is found that the rotational behavior of H3O+ undergoes significant changes as 4He atoms are added.
Little is known about how rotating molecular ions interact with multiple 4He atoms and how this relates to microscopic superfluidity. Here, we use infrared spectroscopy to investigate 4HeN center dot center dot center dot H3O+ complexes and find that H3O+ undergoes dramatic changes in rotational behavior as 4He atoms are added. We present evidence of clear rotational decoupling of the ion core from the surrounding helium for N > 3, with sudden changes in rotational constants at N = 6 and 12. In sharp contrast to studies on small neutral molecules microsolvated in helium, accompanying path integral simulations show that an incipient superfluid effect is not needed to account for these findings.
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