Investigation of high-lying even-parity levels of atomic samarium with multi-color photoionization technique: Energies and radiative lifetimes

• Published in: Journal of quantitative spectroscopy & radiative transfer Vol. 241; p. 106714
• Main Authors: Sahoo, A.C., Mandal, P.K., Shah, M.L., Dev, Vas
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2020
• Subjects: Energy levels; Multi-color photoionization technique; Radiative lifetime; Samarium; Time of flight mass spectrometer; Radiative lifetime; Multi-color photoionization technique; Energy levels; Samarium; Time of flight mass spectrometer
• ISSN: 0022-4073; 1879-1352
• DOI: 10.1016/j.jqsrt.2019.106714

•High-lying even-parity energy levels of atomic samarium in the energy region 32,156.3–32,886.4 cm−1 have been identified using two-color three-step photoionization technique.•A total of 25 high-lying even-parity energy levels is observed in the present work including 10 new energy levels.•The possible total angular momenta of the newly discovered energy levels were assigned by the angular momentum selection rules.•Radiative lifetimes of 20 high-lying even-parity energy levels of atomic samarium are reported for the first time.
We have investigated high-lying even-parity energy levels of atomic samarium in the energy region 32,156.3–32,886.4 cm−1 using two-color three-step photoionization technique. The experiments have been carried out in an atomic beam coupled to a linear time of flight mass spectrometer. The analysis of the photoionization spectra has resulted in the identification of twenty-five high-lying even-parity energy levels of atomic samarium. These include the confirmation of fifteen energy levels reported earlier while the remaining ten energy levels are new. The observed relative photoionization signal intensities of the corresponding transitions are also reported. The possible total angular momenta of the newly discovered energy levels have been assigned by the total angular momentum selection rules. Further, the radiative lifetimes of twenty high-lying even-parity energy levels of atomic samarium were measured for the first time by delayed three-color three-photon resonance ionization spectroscopy via a pump-probe method.