Radiation of X-Rays in Low-Pressure Gas Using LiNbO₃ Single Crystal

Abstract:

The gas pressure and the types of ambient gas dependence of X-ray intensity were investigated for LiNbO3 single crystals polarized in the c-axis direction at pressures of approximately 1 to 30 Pa. The integrated X-ray intensity showed a local maximum value at the pressure Pmax. Pmax moved to the high-pressure side in the ambient with a large first ionization energy. Pmax was proportional to the Boltzmann factor using the first ionization energy of each ambient gas molecule. The X-ray intensity was approximated using the quadratic function, which was convex upward for the pressure. It was found that one of the causes of the decrease in X-ray intensity on the pressure side higher than Pmax was the adsorption of positive ions on the crystal electric surface.

• Periodical: Key Engineering Materials (Volumes 421-422)
• Pages: 205-208
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.421-422.205
• Online since: December 2009
• Authors: Shinji Fukao, Yoshikazu Nakanishi, Tadahiro Mizoguchi, Yoshiaki Ito, Shinzo Yoshikado
• Keywords: LiNbO₃, Positive Ion, Pressure Dependence, Pyroelectricity, Uniaxial Polarization, X-Ray Excitation

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