Journal of Atomic, Molecular, Condensate & Nano Physics Vol. 1, No. 1, pp. 19–30, 2014 RGN Publications http://www.rgnpublications.com Atomic Data for He-like Tungsten Research Article Sunny Aggarwal 1 , A.K. Singh 2 and Man Mohan 3 1,3 Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India 2 Department of Physics, D.D.U. College, University of Delhi, Delhi 110015, India Corresponding authors: 1 sunny.kmc87@gmail.com, 3 drmanmohan.05@gmail.com Abstract. Atomic data on high-Z materials are important for impurity diagnostics due to its possible use in the next generation fusion devices including astrophysics. For this purpose, in the present paper, energies, lifetimes and wave-function compositions have been computed for all level of 1s 2 , 1s2l, 1s3l, 1s4l, 1s5l and 1s6l in highly charged He-like tungsten ion (W LXXIII). Also, we have presented the transition wavelengths, oscillator strengths, transition probabilities and line strengths for the electric dipole (E1) transitions from the levels 1s 2 , 1s2s and 1s2p. Our reported results have been obtained using the fully relativistic GRASP code including the correlations within the n = 6 complex. The validity of the method is assessed through the comparison with the other results previously published. The excellent agreement observed between our new GRASP results and those obtained using different approaches confirm the accuracy of our results. Keywords. Atomic data; Atomic processes PACS. 32.70Cs Received: December 31, 2013 Accepted: April 20, 2014 Copyright © 2014 Sunny Aggarwal et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 1. Introduction Reliable atomic data for the tungsten ions, such as emission line wavelengths and transition probabilities, are of crucial importance both for the diagnostic purposes and the modelling of plasma in fusion reactors. Indeed, because of its high melting point, low tritium retention and erosion rate under plasma loading (see e.g. Pospieszczyk 2006), tungsten will be used as a plasma facing material in the diverter region (Matthews et al. (2009), Skinner (2008, 2009), Hawryluk et al. (2009)) in the development of future tokamaks, such as ITER. Additionally, tungsten is of interest in astrophysics (Hensberge et al. (1986)). Therefore, wavelengths and transition rates in various ionization stages of tungsten must be determined with high confidence from the