Study of n=2,Δn=0 transition of Be-, B-, C-, N- and O-like sequence in the beam--foil spectrum of titanium

The foil-excited the spectrum of highly stripped titanium ions between 12--40 nm has been studied. Titanium ions of 80 and 120~MeV were provided by the HI-13 tandem accelerator at the China Institute of Atomic Energy. GIM-957 XUV-VUV monochromator was refocused to get highly-resolved spectra. Our experimental results and the published spectral data of laser-produced plasma show agreement in nearly all cases within \pm 0.03nm. The spectra contained some weak or strong lines previously unclassified. These spectral lines mainly belong to 2s2p^2 for TiXVIII, 2p^3 for TiXVIII, 2s2p^3 for TiXVII, 2p^64p for Ti XII and 2p^63d for Ti XII transitions.