J.J. Wynne, J.A. Armstrong, et al.
Physical Review Letters
Using multiphoton-ionization spectroscopy, we have observed transitions from the 1S0 ground states to the 4snp, 5snp, and 6snp 3P0 states of the alkaline earth atoms Ca, Sr, and Ba, respectively. One-photon transitions from a 1S0 ground state to 3P0 states are spin-forbidden. We have identified these series in Ca and Sr up to n > 70, whereas previous efforts have failed to identify these series beyond n = 7. These series behave like nearly constant quantum-defect (δ) series with δCa = 1.97 and δSr = 2.90. Preliminary results for Ba, up to n = 60, indicate greater complexity. © 1977 (publisher). All right reserved.
J.J. Wynne, J.A. Armstrong, et al.
Physical Review Letters
J.A. Armstrong, Eric Courtens
IEEE JQE
E. Haupt, J.J. Wynne
Cryogenics
P.F. Moulton, W. Künzel, et al.
Applied Physics B Photophysics and Laser Chemistry