Determination of radiative lifetimes of neutral bismuth by time-resolved uv-vuv laser spectroscopy

Abstract

Time-resolved laser spectroscopy was used to measure natural radiative lifetimes of ten excited states of neutral bismuth. Four levels of the 6p ns P&/& sequence (n =7,8,9, 10) and the 6p 7s P3/2 5/2 and 6p nd D3/2. 5/2 (n =6,7) levels were investigated. The results are compared with previous data when possible. Revised absolute transition probabilities for 26 lines are given. Several levels required vacuum-ultraviolet (vuv) excitation, which was achieved by stimulated anti-Stokes Raman shifting of frequency-tripled dye-laser radiation in high-pressure H& gas.

Atomic Transition Probabilities in Bi II

“…A similar situation has been met in Bi I where it has been observed that the measurements from Ref. [21], when compared with accurate time-resolved laser spectroscopy measurements [22], show, for some levels, large discrepancies which can reach a factor of 3! As a consequence, the delayed-coincidence results for Bi II need also to be checked by new accurate laser measurements.…”

“…Radiative lifetimes of 18 atomic and 13 ionic levels of bismuth have been measured [21] using a multichannel delayed coincidence method with crossed beam (atoms and electrons). However, a recent comparison of the latter results with accurate time-resolved laser spectroscopy measurements [22] in neutral bismuth has shown, for some levels, large discrepancies.…”

Theoretical Study of Several Oscillator Strengths and Lifetimes of Germanium, Thallium and Bismuth. Measures of Some Relative Transition Probabilities

“…Data on atomic properties are relevant not only for spectroscopy; these values are also of interest in a variety of other fields in physics and technology. Calculations of oscillator strength for different transitions in Thallium, Bismuth and Germanium has been the subject of numerous theoretical studies [4][5][6][7][8].…”

“…To provide level energy for our calculation we have used the Tables of Moore [10]. 'Biemont et al (1999) ' Caiyan et al (1995) ' Alonso-Medma(1996a) ' Ahnso-Medina(1997) Also in this work we present experimental values for several lines corresponding to different transitions of Tl I, Tl II, Ge I, Ge II, Bi I and Bi II. Relative values have been obtained from measures of emission hue intensities in hollow cathode lamp discharges operating with a typically current of 10 mA.…”

Study by Optical Spectroscopy of Bismuth Emission in a Nanosecond-Pulsed Discharge Created in Liquid Nitrogen

“…Transitions belonging to the Bi I and Bi II systems were identified during this study. They are listed in Table 1 (see Figure S1 for the visualization of transitions in the corresponding Grotrian diagrams) [ 26 , 27 ]. The last three columns contained data evaluated for the present study from the experimental spectra.…”