The vapor pressure of potassium has been measured in absorption using a cw tunable laser and calibrated against the accurate radiative lifetime of the 4s—4p doublet of potassium. An accurate value of 20,850 ± 30 cal/mol for the heat of vaporization (from the liquid phase) at the melting point was determined.
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Shirinzadeh et al. (1983) studied this question.
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