In fusion research, atomic and molecular data of fuel hydrogen, helium produced by nuclear reaction, and impurities produced from plasma facing materials are necessary for particle and heat control, plasma diagnosis, and so on [1]. This paper gives an overview of recent atomic and molecular data activities for fusion research at JAERI.
We have recently been compiling cross section data for molecules, such as H₂, hydrocarbon, and so on, that play important roles in low-temperature divertor plasmas. In order to facilitate practical use of the data, semi empirical formulas are derived from the evaluated data [2]. The databases are available through Web at URL = http://www-jt60.naka.jaeri.go.jp/JEAMDL/index.html. In collaboration with NIST, we have been compiling spectral data for highly-ionized heavy atoms (Ar, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Ga, Kr, Mo, and W) that occur either as impurities in fusion plasmas or which have been injected into fusion plasmas for heat control or plasma diagnosis [3]. In collaboration with Japanese universities, cross section data for charge transfer and electron collision at low energy have also been being produced.

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