Time Evolution of Optical Emission Spectrum of a Hg-HID Lamp Exposed to X-ray

• Published in: Plasma chemistry and plasma processing Vol. 30; no. 4; pp. 449 - 459
• Main Authors: Harabor, N. A., Harabor, A., Palarie, I., Popescu, I. M., Zissis, G.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.08.2010; Springer Verlag
• Subjects: Augers; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Classical Mechanics; Density; Electron temperature; Engineering Sciences; Inorganic Chemistry; Irradiation; Lamps; Mechanical Engineering; Mercury; Optics; Original Paper; Photonic; Plasmas; Walls; X-rays; HID lamps; X-ray irradiation; Spectrum analysis
• ISSN: 0272-4324; 1572-8986
• DOI: 10.1007/s11090-010-9228-5

Time variation of optical emission lines for Hg, and other elements detected in a mercury HID lamp before and during X-ray irradiation were analyzed. Various irradiation conditions are causing differences in time dependencies of all Hg spectral line intensities (including that of 253.73 nm resonance line not completely self-absorbed). The X-ray optical depths are smaller in the case of Hg gas compared with burner wall glass. The free electrons generated during X-ray exposure (photoelectrons, Auger electrons) contribute to changes in plasma characteristics (e.g. plasma temperature, density, etc.) in transitory regime. In quasi-stable regime there are practically no differences between electron temperatures for normal and irradiated lamp. A qualitative explanation in the framework of Beer-Lambert law is given.