Perhitungan Temperatur Plasma-Laser Dengan Metode Perbandingan Intensitas Dua Garis Emisi Zinc(Zn)

Abstract An experiment calculated the zinc-plasma temperature using two emission intensity lines ratio method from Boltzmann equation had been conducted. The aim of this research is to choose a suitable two-wavelength pair to determine the zinc-plasma temperature in shock excitation state region. When Nd-YAG (1064 nm, 7 ns, 80 mJ) laser was focused on surface of zinc plate sample, it produced zinc plasma. The emission intensities of Zinc wavelengths in this plasma was captured by spectrometer and it was possible to make five combinations of ratio two wavelength intensities which fulfilled the Boltzmann equation. Varying the delay time detection, the shock excitation state region was determined about 5 ns from the laser bombardment. Based on the intensity data and Boltzmann equation, the average temperature of five combinations from ratio two different wavelength intensities is 3064 0K, with maximum deviation of 6%. Based on the data, it can be concluded that the intensity ratio of (328.2 nm / 472.2 nm) is the most suitable for determining the temperature of zinc plasma with maximum error of 1.68 % from average temperature. Keywords : Temperature, Boltzmann, Zn, ratio method