Influence of argon fraction on plasma parameters in H2-N2 mixture discharge with cathodic cage Muhammad Naeem, Mujahid Zaka-ul-Islam, Zahid Iqbal Khattak, Muhammad Shafiq and Muhammad Zakaullah Eur. Phys. J. Appl. Phys., 77 1 (2017) 10801 Published online: 27 January 2017 DOI: 10.1051/epjap/2016160280