Equilibrium surface composition of sulfuric acid films in contact with various atmospheric gases (HNO3, CO2, CH2O, Cl2, NO, NO2)

被引：7

作者：

Fairbrother, DH ^{[1
]}

Somorjai, GA ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 19期

关键词：

D O I：

10.1021/jp992889f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Differentially pumped X-ray photoelectron spectroscopy has been used to study the surface composition of sulfuric acid (H2SO4) and sulfuric acid/water mixtures in equilibrium with various atmospheric species. Nitric acid uptake in sulfuric acid solutions was observed below approximate to 220K. Compared to the theoretically predicted bulk composition, a significant enrichment of nitrogen was observed at the interface. The uptake of background water in sulfuric acid below 200 K was responsible for the reversible uptake of CO2, moderated through the formation of carbonic acid (H2CO3). For CH2O, Cl-2, NO, and NO2, no observable surface species were observed over the temperature range studied (approximate to 180-298 K).

引用

页码：4649 / 4652

页数：4

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