An investigation of aqueous ammonium nitrate aerosols with soft X-ray spectroscopy

被引:5
作者
Weeraratna, Chaya [1 ]
Kostko, Oleg [1 ]
Ahmed, Musahid [1 ]
机构
[1] Lawrence Berkeley Natl Lab, Chem Sci Div, Berkeley, CA 94720 USA
关键词
Ammonium nitrate; X-ray photoelectron spectroscopy; near-edge X-ray absorption spectroscopy; velocity map imaging; PHOTOELECTRON-SPECTROSCOPY; ROTATIONAL-DYNAMICS; MODEL SIMULATION; SOLVATION; ENERGY; ION; NANOPARTICLES;
D O I
10.1080/00268976.2021.1983058
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
Aqueous aerosols are important in atmospheric chemistry, drug delivery, and human health. X-ray photoelectron spectroscopy (XPS), a surface-sensitive technique and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy which informs on the bulk, is deployed to study the solvation of ammonium nitrate (NH4NO3). Aerosolised solutions of NH4NO3 were introduced into a photoelectron spectrometer via an aerodynamic lens, and interrogated with soft X-ray photons, the resulting electrons were imaged via velocity map imaging. Density functional theory calculations were performed to compare with the measured binding energies of NH4+ and NO3- solvated in water. The results reveal that the nitrate anion has a slight propensity for the surface, while both ammonium and nitrate ions are present in equal measure in the bulk.
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页数:7
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