Manganese electronic entropy

Hou, J.-M., Boichenko, V.A., Diner, B.A., Mauzerall, D. (2001) Thermodynamics of electron transfer in oxygenic photosynthetic reaction centers Volume change, enthalpy, and entropy of electron transfer reactions in manganese-depleted photosystem II core complexes, Biochemistry 40(24), 7117-7125. 

In addition to the estimated properties, we measured the thermochemistry of several important vapor species. These measurements were conducted in a Knudsen effusion cell using special line-of-sight vaporization under subambient pressures with flowing O2 and H2O vapor mixtures [4]. The gaseous species over silica [5], manganese oxide [6], lanthana, alumina, and palladium metal were detected and relative partial pressures measured as a function of temperature. These vapor pressure measurements were calibrated by using the known metal atom or binary metal oxide volatility as a calibration source. Oxide species concentrations were measured relative to that of a reference compound, e.g., metal atom. The identification of oxide and hydroxide compounds was facilitated by Ae technique of threshold electron ionization [7]. These data were then evaluated using estimated entropy functions and the third law temperatures. 

---