TITLE

New method of energy–mass dispersion applied to mass spectral data from positively charged water vapor clusters

AUTHOR(S)
Walrafen, George E.; Carlon, Hugh R.
PUB. DATE
October 2004
SOURCE
Canadian Journal of Chemistry;Oct2004, Vol. 82 Issue 10, p1462
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A new method is presented by which energy–mass, volume–mass, and enthalpy–mass dispersion curves may be determined for charged water vapor clusters. This method involves two closely spaced partial pressures at a fixed temperature. The method is exemplified by using mass spectral data from positively charged water vapor clusters (H+(H2O)M) where 6 ≤ M ≤ 45. A ΔG–mass dispersion was also determined using the ΔH–mass dispersion for comparison. ΔG displays an enormous minimum, which is of signal importance because it indicates that a size of maximum stability (SMS) exists. The SMS corresponds to M = 13 for pressures between 0.056 and 0.151 bar (1 bar = 100 kPa) at 373.15 K, and to M = 32±1 for pressures between 0.473 and 0.556 bar at 372.15 K. The free energy corresponding to M = 45 occurs far above that corresponding to the SMS. The resultant instability leads to condensation for pressures above 0.556 bar at 372.15 K.
ACCESSION #
15382271

 

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