Issue 5, 2004

Formation and phase distribution of nitric acidhydrates in the mole fraction range xHNO3 < 0.25: A combined XRD and IR study

Abstract

Liquid binary nitric acid/water aerosols (x < 0.25) were shock- frozen (quenched) into X-ray amorphous solids at 35 K. Careful thermal treatment in the temperature interval 35 K < T < 255 K provided the equilibrium phases ice and β-nitric acid trihydrate (β-NAT) as well as the non-equilibrium phases α-NAT, α-nitric acid dihydrate (α-NAD), and nitric acid pentahydrate (NAP, ?). The stability conditions with respect to temperature and composition were determined by X-ray diffraction (XRD) and infrared spectroscopy. In the case of α-NAT they significantly depend on the simultaneous presence of ice such that they overlap with the respective stratospheric conditions.

Article information

Article type
Paper
Submitted
02 Sep 2003
Accepted
20 Jan 2004
First published
06 Feb 2004

Phys. Chem. Chem. Phys., 2004,6, 972-979

Formation and phase distribution of nitric acid hydrates in the mole fraction range xHNO3 < 0.25: A combined XRD and IR study

H. Tizek, E. Knözinger and H. Grothe, Phys. Chem. Chem. Phys., 2004, 6, 972 DOI: 10.1039/B310672A

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