کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5427968 | 1508651 | 2015 | 7 صفحه PDF | دانلود رایگان |
- A technique was developed to measure pressure broadening in glow discharge plasma.
- Pressure broadening coefficients for a transition in Ar and Kr were determined.
- The technique is applicable for natural mixture of Kr isotopes.
- The technique is insensitive to temperature gradients in plasma.
Tunable diode laser spectroscopy technique was employed to determine pressure broadening coefficients for the (n+1)s[3/2]2â(n+1)p[5/2]3 transitions in Ar and Kr in RF discharge plasma. The widths of Gaussian and Lorentian components of the absorption lines were determined simultaneously by fitting absorption line profiles obtained in experiments to a Voigt profile. The technique was validated in measurements of pressure broadening coefficient for 811.5 nm Ar absorption line in the pressure range of 15-75 Torr. The obtained values for these coefficients reduced to 300 K are ξAr-Ar=(2.8±0.1)Ã10â10 sâ1 cm3 for broadening in the parent gas and ξAr-He=(3.2±0.2)Ã10â10 sâ1 cm3 in helium.For krypton, isotope abundance was accounted for and appropriate fit function was constructed permitting to determine pressure broadening coefficients using the natural mixture of isotopes. For krypton 811.3 nm line these coefficients are ξKr-Kr=(2.4±0.2)Ã10â10 sâ1 cm3 and ξKr-He=(3.1±0.2)Ã10â10 sâ1 cm3.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 164, October 2015, Pages 1-7