Thermodynamics of cluster ions containing NH[sub 3] and H[sub 2]SO[sub 4]

Froyd, Karl D.; Lovejoy, Edward R.
August 2000
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p327
Academic Journal
The stability of cluster ions of the form NH[sub 4][sup +] (NH[sub 3])[sub X] (H[sub 2]SO[sub 4])[sub Y] and HSO[sub 4][sup -] (NH[sub 3])[sub x] (H[sub 2]SO[sub 4])[sub y] was studied with an ion-molecule flow reactor coupled to a quadrupole mass spectrometer. Equilibrium constants for the association of NH[sub 3] with these species were measured and Gibbs free energy changes were derived. The binding of NH[sub 3] appears to be enhanced by the presence H[sub 2]SO[sub 4], and vice versa. These stable cluster ions may be important precursors for atmospheric aerosols.


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