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A new technique to study the entrainment of air into the inductively coupled argon plasma is presented. The combination of vibrational Raman scattering and Rayleigh scattering enables measuring absolute particle densities of air and argon. The measurements show the entrainment of air into the plasma. At an axial position of 2 mm above the end of the quartz torch it is found that at 90% of the plasma...
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