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arXiv · 1002.1297

Isotope shift in the Sulfur electron affinity: observation and theory

Thomas Carette·Cyril Drag·Oliver Scharf·Christophe Blondel·Christian Delsart·Charlotte Froese Fischer·Michel Godefroid
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Abstract

The electron affinities eA(S) are measured for the two isotopes 32S and 34S (16752.9753(41) and 16752.9776(85) cm-1, respectively). The isotope shift in the electron affinity is found to be positive, eA(34S)-eA(32S) = +0.0023(70) cm-1, but the uncertainty allows for the possibility that it may be either "normal" (eA(34S) > eA(32S)) or "anomalous" (eA(34S) < eA(32S)). The isotope shift is estimated theoretically using elaborate correlation models, monitoring the electron affinity and the mass polarization term expectation value. The theoretical analysis predicts a very large specific mass shift that counterbalances the normal mass shift and produces an anomalous isotope shift, eA(34S)-eA(32S) = - 0.0053(24) cm-1. The observed and theoretical residual isotope shifts agree with each other within the estimated uncertainties.

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Thomas Carette, Cyril Drag, Oliver Scharf, Christophe Blondel, Christian Delsart, Charlotte Froese Fischer, Michel Godefroid. 2010-02-05. Isotope shift in the Sulfur electron affinity: observation and theory. https://doi.org/10.1103/physreva.81.042522

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