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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:52 |
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Conference: Bucharest University Faculty of Physics 2011 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Optical emission spectroscopy in ffotodynamic therapy applications
Authors:
P. Chiru,I. Jepu, C. Porosnicu, C. P. Lungu, A.M. Lungu, C.M.Ticos
Affiliation:
National Institute for Lasers, Plasma and Radiation Physics, Magurele-Bucharest, RO
E-mail
petrica.chiru@inflpr.ro
Keywords:
OES, plasma temperature
Abstract:
Efficient photodynamic therapy application requires a constant improvement in the transmission radiation technology field and also for different types of photosensitizing devices in order to destroy malignant tumors.
For this, a system that permits testing different configurations of spectral gas discharge tubes (Ar, Xe) at different values for the inside gas pressure was conceived. In this experiment, the discharge tube was made out of quart with a length of 11 cm and 8cm in diameter, having the electrodes made out of tungsten.
An AC power supply was used having a voltage range of 0-1000 V and an ajustable frequency between 8-25 KHz. The emission spectra had been acquired and analyzed using a SM240 CCD Spectrometer (Spectral Products, USA) using an UV type optical fiber.
The electron temperature (Te) has been estimated using a method based on optical emission spectroscopy (OES). The advantage of this technique consists in being an inexpensive and convenient method of plasma/ electrical discharge characterization. Qualitative overview of plasma composition can be obtained quickly from line and/or band intensities present in plasma.
Plasma temperature was evaluated for the discharges of the Ar and Xe atoms. The method consists in selecting two representative lines of the species. Using the ratio of their relative intensities (I1 and I2) we estimated the electron temperature (Te) of the produced plasma with a formula based on the Boltzmann distribution of the species.
In this work are presented the analysis of the optical emission spectra, spatial distribution of the electron temperature (Te) and also the discharge gas pressure dependency of the electron temperature (Te).
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