In this work the effect of laser pulse energy on the optical properties of five samples of SiO2 thin film deposited using pulse laser deposition technique was studied. Pulse energies of 100,150,180, 200 and 250 mj with fixed pulse repetition rate and number of pulses of 2 Hz, and 10 pulses, were used. The target to substrate distance and angle were fixed. The film thickness was measured by FESEM, and the transmission spectrum at certain wavelengths for each film was recorded. SiO2 thin films transmission data and the measured film thicknesses were used to deduce their optical properties. The results showed that increasing the pulse energy results in an increase of the film thickness and the morphology of the films becomes more dense and non-smooth at higher pulse energy, also the optical properties showed to be affected by the thickness variation and hence by the pulse energy.
In this work, the optical properties (absorption, absorption coefficient, refractive index, band-gap energy, extension coefficient, and reflection) of the five samples of isonitrosoacetophenone (C 8 H 7 NO 2) was studied using Uv-Vis spectroscopy. The C 8 H 7 NO 2 was dissolved in different amounts of (0.5, 1, 1.5, and 2) ml of distilled water. The effect of concentration on the optical properties of C 8 H 7 NO 2 was investigated experimentally and it was shown that the different values of the calculated optical properties are clearly affected by the concentrations of the C 8 H 7 NO 2 compound. In addition, when the isonitrosoacetophenone is mixed with 2.0 ml of water the absorbance rate of the pure isonitrosoacetophenone was shown to be decreased from 2.7×10-4 (a. u.) at 278 nm to 1×10-4 (a. u.) at the same wavelength. Furthermore, the transmission of C 8 H 7 NO 2 was shifted towards the shorter wavelength as the concentration of water is increased, which is starts from ~346 nm for pure isonitrosoacetophenone and decreased to ~ 300 nm when mixed with 2.0 ml of water. The important finding of this work was that the compound C 8 H 7 NO 2 is opaque (non-transmittance) material from the wavelength of 220 to 300 nm which corresponds to the UV portion of the electromagnetic spectrum and this suggests more study in this area.
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