A state of Hg with an excitation potential of 9 v has been found to be metastable. It is most likely the ³D₃ state of the configuration (5d)⁹(6s)²(6p). It is possible that other members of this configuration also are long-lived. The use of alkali metals as detectors for metastable atoms is discussed.
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William Lichten (1958) studied this question.
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