Single-Particle Characterization of Summertime Antarctic Aerosols Collected at King George Island Using Quantitative Energy-Dispersive Electron Probe X-ray Microanalysis and Attenuated Total Reflection Fourier Transform-Infrared Imaging Techniques

- Low-Z particle EPMA measurements were carried out on a JEOL JSM-6390 SEM equipped with an Oxford Link SATW ultrathin window energy-dispersive X-ray (EDX) detector. X-ray spectra were recorded under the control of INCA software (Oxford). An accelerating voltage of 10 kV, beam current of 0.5 nA, and a typical measuring time of 15 s were employed.

- ATR-FT-IR imaging measurements were performed using a Perkin-Elmer Spectrum 100 FT-IR spectrometer interfaced to a Spectrum Spotlight 400 FT-IR microscope. For ATR imaging, an ATR accessory employing a germanium hemispherical internal reflection element (IRE) crystal with a diameter of 600 μm was used.
A new single particle analytical methodology that combines low-Z particle EPMA and ATR-FT-IR imaging technique will be developed to obtain the full description for the micro-physicochemical properties of the same individual Antarctic aerosol particles.

- 本实验采用搭载牛津Link SATW超薄窗口能量色散X射线（Energy-dispersive X-ray, EDX）探测器的JEOL JSM-6390型扫描电子显微镜（Scanning Electron Microscope, SEM），开展低原子序数颗粒电子探针显微分析（Low-Z particle EPMA）测试。X射线谱图由INCA软件（牛津仪器）控制采集。实验采用10 kV加速电压、0.5 nA束流，以及典型的15 s测量时长。
- 衰减全反射傅里叶变换红外（Attenuated Total Reflection-Fourier Transform Infrared, ATR-FT-IR）成像测试采用珀金埃尔默Spectrum 100型傅里叶变换红外光谱仪，该仪器与Spectrum Spotlight 400型傅里叶变换红外显微镜联用。针对ATR成像，本实验使用了直径为600 μm的锗半球内反射元件（Internal Reflection Element, IRE）晶体作为ATR附件。
本研究将开发一种结合低原子序数颗粒电子探针显微分析（Low-Z particle EPMA）与衰减全反射傅里叶变换红外（ATR-FT-IR）成像技术的单颗粒分析新方法，以完整表征同一南极气溶胶单颗粒的微观物理化学性质。