P K Mandal
Articles written in Pramana – Journal of Physics
Volume 75 Issue 6 December 2010 pp 1141-1144 Conributed Papers
We report the measurement of photoexcitation cross-sections of three first-step uranium transitions $(0 \rightarrow 16900.38$ cm-1 , $0 \rightarrow 17361.89$ cm-1 and $620 \rightarrow 17361.89$ 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.
Volume 82 Issue 2 February 2014 pp 403-408 Contributed Papers
In this paper, we report the investigations of lifetime measurement of odd-parity energy level 19009.52 cm-1 of Sm I using simultaneous detection of laser-induced fluorescence and laserinduced photoionization signals employing pump–probe technique. To the best of our knowledge, this is for the first time that the results obtained using laser-induced fluorescence and photoionization techniques have been compared with each other. The obtained results match well with those reported in the literature.
Volume 94, 2020
Continuous Article Publishing mode
Click here for Editorial Note on CAP Mode