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The field ionization of water is observed utilizing a mass spectrometer. The existence of H 4 O + is confirmed. The energy distributions of the ions are investigated. Under certain conditions the energy distributions form two peaks. The appearance potentials of the polymers H 3 O + ⋅ n H 2 O, n...
The expansion of the density and pressure in terms of power series of activity, with cluster integrals as coefficients, is derived with the help of a new method. Rather than expanding at once the entire configurational partition function ( 3N ‐dimensional volume) the expansion here is applied...
A cluster expansion is written for the partition function of a polymer chain. An exact expression relating “nodal” and “elementary” graphs is presented. An analog of the Percus–Yevick approximation is made which leads to an integro‐difference equation. This equation is solved exactly...
Absorption and emission bands have been observed in crystals containing the hexaurea chromium(III) ion. The moderately sharp features in the region 14 160–14 250 cm −1 have been examined in some detail in the temperature range 1.5°–300°K. A broad emission band has been seen at 12 300 cm...
The gaseous phase in thermodynamic equilibrium with the condensed cerium–carbon system has been investigated by means of the combined Knudsen‐cell–mass‐spectrometric technique in the temperature range 1990°–2300°K. In addition to cerium atoms, the gaseous carbide molecules CeC 2 and...
Reanalysis of the published vinyl iodide microwave spectrum produced refined values of previously measured constants, and determined two quantities hitherto not known with precision: χ a b χ a b , the off‐diagonal quadrupole coupling constant, and Δ, the interial defect. This value of Δ...
The photoionization‐efficiency curve of ethylene has been shown to have vibrational structure at the threshold for production of the first excited state of the parent ion. Autoionization of superexcited states in this region does not occur significantly. Appearance potentials were measured for...
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