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Gas effect on the emission and detection of the backscattered electrons in a VP-SEM at low energy
Z Hafsi1, O Mansour2, A Kadoun1
1L2MSM Laboratory, Physics Department, Faculty of Exact Sciences, Djilali Liabes University BP.89 Sidi Bel-Abbes 22000, Algeria.
Abstract:
The effect of the electron beam skirting on the emission and detection of the backscattered electrons (BSE) in a low vacuum scanning electron microscope is investigated at low energy regime. Monte Carlo computed dependencies of the BSE distribution on the water vapor and air pressure shown a significant increase of the extent of the BSE exit zone. The pressure variation has however a little effect when helium gas is used. A new approach based on the comparison between the sizes of the skirt and the BSE exit zone on the specimen surface provides a useful tool to determine the operating pressure range that ensures minimal degradation of the lateral resolution in BSE imaging mode.
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