The photoabsorption spectra of Te I - Te V have been recorded and analysed in the XUV spectral region using the dual laser produced plasma technique. Photoexcitation from the 4d subshell is the dominant process in the 35-150 eV energy region. For photon energies between 35-45 eV discrete structure corresponding to 4d-np (n ≥5) transitions were obtained. Above the 4d ionisation threshold the spectra of Te I - Te III were found to be dominated by a 4d-ef shape resonance, which peaks at ∼88 eV in each case. A transfer of oscillator strength from the resonance to discrete 4d-nf (n ≥4) transitions with increasing ionisation is clearly evident, and the 4d105s 25p → 4d95s25p4f transitions are the strongest features in the Te IV spectrum. Hartee-Fock with configuration interaction and time dependent local density approximation calculations successfully account for this behaviour and permit identification of the discrete features. The use of a prepulse to maximise the brightness of a tungsten continuum emitting plasma was also investigated.
|Number of pages||8|
|Journal||Proceedings of SPIE - The International Society for Optical Engineering|
|Publication status||Published - 2005|
|Event||Opto-Ireland 2005: Optical Sensing and Spectroscopy - Dublin, Ireland|
Duration: 04 Apr 2005 → 06 Apr 2005
- Laser plasma
- Photoabsorption spectroscopy