Soft X-ray and cathodoluminescence measurement, optimisation and analysis at liquid nitrogen temperatures

[摘要] Advances in field emission gun electron microprobes have led to significant gains in the beam power density and when analysis at high resolution is required then low voltages are often selected. The resulting beam power can lead to damage and this can be minimised by cooling the sample down to cryogenic temperatures allowing sub-micrometre imaging using a variety of spectrometers. Recent advances in soft X-ray emission spectrometers (SXES) offer a spectral tool to measure both chemistry and bonding and when combined with spectral cathodoluminescence the complementary techniques enable new knowledge to be gained from both mineral and materials. Magnesium and aluminium metals have been examined at both room and liquid nitrogen temperatures by SXES and the L-emission Fermi-edge has been observed to sharpen at the lower temperatures directly confirming thermal broadening of the X-ray spectra. Gains in emission intensity and resolution have been observed in cathodoluminescence for liquid nitrogen cooled quartz grains compared to ambient temperature quartz. This has enabled subtle growth features at quartz to quartz-cement boundaries to be imaged for the first time.

[发布机构] CSIRO Mineral Resources, Microbeam Laboratory, Private Bag 10, Clayton South; VIC; 3169, Australia^1;CSIRO Energy, 26 Dick Perry Avenue, Kensington; WA; 6152, Australia^2

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Complementary techniques;Cryogenic temperatures;Electron microprobes;Emission intensity;Liquid nitrogen temperature;Lower temperatures;Soft X-ray emission spectrometers;Thermal broadening