L. R. Carlson, J. A. Paisner, E. F. Worden, S. A. Johnson, C. A. May, and R. W. Solarz, "Radiative lifetimes, absorption cross sections, and the observation of new high-lying odd levels of 238U using multistep laser photoionization*," J. Opt. Soc. Am. 66, 846-853 (1976)
We report the observation of over 100 new high-lying odd levels in atomic uranium between 32 600 and 34 200 cm−1 using tunable laser techniques. These augment the 32 odd levels previously determined in this energy regime by conventional atomic spectroscopy. The method used in these studies, multistep photoionization under pulsed dye laser excitation, was also employed to make J assignments, measure radiative lifetimes, and to obtain absorption cross sections of transitions involving these levels.
Mukesh Lal Shah, Gomati Prasad Gupta, Vas Dev, Bishwaranjan Dikshit, Manmohan Singh Bhatia, and Brij Mohan Suri J. Opt. Soc. Am. B 29(4) 600-606 (2012)
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Lifetimes of high-lying odd levels and peak Doppler absorption cross sections at 2100 °C and gA values for transitions from the J = 6 even level at 16 505 cm−1 to these levels in 238U.
Asterisk denotes odd level from Ref. 6 or 8.
Referenced to the measured peak σ for the 6056.8 Å transition (Ref. 13) at 2100 °C of σ = 0.59 × 10−14 cm2. The peak Doppler cross section for 238U is given by
, where A is the Einstein transition probability (s−1), T is the temperature (°K), λ is the transition wavelength (in Å), and g1 and g2 are the degeneracies for the lower and upper levels, respectively.
The relative uncertainty for the values is about 30%, the uncertainty in the absolute values is at least this large.
Lifetimes of high-lying odd levels and peak Doppler absorption cross sections at 2100 °C and gA values for transitions from the J = 6 even level at 16 505 cm−1 to these levels in 238U.
Asterisk denotes odd level from Ref. 6 or 8.
Referenced to the measured peak σ for the 6056.8 Å transition (Ref. 13) at 2100 °C of σ = 0.59 × 10−14 cm2. The peak Doppler cross section for 238U is given by
, where A is the Einstein transition probability (s−1), T is the temperature (°K), λ is the transition wavelength (in Å), and g1 and g2 are the degeneracies for the lower and upper levels, respectively.
The relative uncertainty for the values is about 30%, the uncertainty in the absolute values is at least this large.