FTIR spectroscopic studies of the simultaneous condensation of HCl and H2O at 190 K – Atmospheric applications

Abstract

Abstract. Type II polar stratospheric cloud particles are made up of ice that forms by water vapor condensation in the presence of numerous trace gases, including HCl. These gaseous species can co-condense with water molecules and perturb ice structure and reactivity. In order to investigate the effect of co-condensing dopants on the structure of ice, we have designed an experimental system where ice films can be stabilized at 190 K, a temperature relevant to the polar stratosphere. We have co-condensed different HCl : H 2 O gaseous mixtures, with ratios 5:1, 1:10, 1:50 and 1:200 and studied the solids formed by infrared spectroscopy. The IR spectra obtained show that: (1) HCl is likely undergoing ionic dissociation when it is incorporated by co-condensation into the ice at 190 K; (2) this dissociation is done by several water molecules per HCl molecule; and (3) significant differences between our spectra and those of crystalline solids were always detected, and indicated that in all cases the structure of our solids retained some disorganized character. Considering the major impact of HCl on ice structure observed here, and the well known impact of the structure of solids on their reactivity, we conclude that the actual reactivity of stratospheric ice particles, that catalyze reactions involved in ozone depletion, may be different from what has been measured in laboratory experiments that used pure ice.

Melt surface grafting of HDPE with mercaptoesters by thermolysis method

“…FTIR spectrometer is a useful tool for various science and engineering fields, because of its high sensitivity or detectivity of traces amount of substance, low noise to signal ratio and this method is an easy and inexpensive one. FTIR spectroscopy is used for the determination of anti oxidant efficiency in sunflower oil [11], characterization of nitrile rubber [12], textural properties of CuO thin films [13], food hydrocolloids in confectionary [14], and cancerous tissues of esophagus [15] and in atmospheric applications [16]. Apart from the above-mentioned qualitative applications, recently the utilization of FTIR spectrophotometer in quantitative determination has also been found.…”

Melt functionalization of linear low‐density poly(ethylene) with succinimide and N‐hydroxy succinimide by thermolysis method

“…FTIR spectrometer is a useful tool for various science and engineering fields, because of its high sensitivity or detectivity toward traces amount of substance, low noise to signal ratio and this method is an easy and inexpensive one. FTIR spectroscopy is used for both qualitative [14][15][16][17][18][19] and quantitative [20][21][22][23][24][25][26][27][28][29][30] purposes. By thorough literature survey, we could not find any report based on FTIR based kinetics of SI and NHS functionalized LLDPE.…”

Synthesis and characterizations of calcium di(meth)acrylate divinyl monomers and melt surface graft functionalization with linear low density poly(ethylene)

“…Moreover, this method is easy and inexpensive one. FTIR spectroscopy is used in both qualitative [16][17][18][19][20][21] and quantitative [22][23][24][25][26][27][28][29][30][31][32] applications. The above literature survey indicates that FTIR kinetic reports on functionalization of LLDPE with metal salts are not available.…”