Measurement of photoexcitation cross-sections of uranium by saturation method |
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Authors: | M L Shah R C Das P K Mandal D R Rathod Vas Dev K G Manohar and B M Suri |
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Institution: | (1) Atomic and Molecular Physics Laboratory, Department of Physics, Quaid-i-Azam University, 45320 Islamabad, Pakistan; |
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Abstract: | We report the measurement of photoexcitation cross-sections of three first-step uranium transitions (0 → 16900.38 cm −1, 0 → 17361.89 cm −1 and 620 → 17361.89 cm −1) using saturation method. These measurements were performed on a resonance ionization mass spectrometry (RIMS) set-up consisting
of Nd:YAG-pumped dye lasers, a reflectron time-of-flight mass spectrometer and high-temperature atomic vapour source. The
uranium vapours were excited and photoionized by two-colour, three-photon photoionization scheme using Nd:YAG-pumped dye laser
system. The resultant photoion signal was monitored as a function of dye laser fluence used for first step excitation to measure
the excitation cross-section values. A new approach was adopted to overcome the large uncertainties associated with such measurements.
With this approach the cross-section of transitions whose value is already reported in the literature was measured as a bench
mark. By normalizing the measured value to the reported value, a scaling factor was derived. This scaling factor was used
to scale up the cross-section values of other transitions measured by this method. |
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