Spectrum and energy levels of nine-times ionized strontium (Sr X)
The spectrum of the copperlike ion Sr X was observed with a low-inductance spark in the region 70--630 A on the 10.7--m grazing-incidence spectrograph at the National Bureau of Standards. From the identification of 30 lines, a system of 23 energy levels of the type 3d/sup 10/nl was determined. The level system includes the configurations ns (n = 4--7), np (n = 4--6), nd (n = 4--6), nf (n = 4--6), and ng (n = 5). The 4f/sup 2/F term is inverted. Also identified were 12 transitions of the type 3d/sup 10/4s--3d/sup 9/4s4p and 3d/sup 10/4p--3d/sup 9/4p/sup 2/, permitting the determination of several 3d/sup 9/4s4p and 3d/sup 9/4p/sup 2/ levels. The observed 3d/sup 10/nl energy levels and parameters are compared with Hartree--Fock calculations. The ionization energy is determined from the 3d/sup 10/ns and nf series to be 1 430 000 +- 500 cm/sup -1/ (177.30 +- 0.06 eV). Data for 3d--4p transitions in Sr IX and Sr XI and 3p--3d transitions in Sr XII are also presented.
- Research Organization:
- National Bureau of Standards, Washington, D. C. 20234
- OSTI ID:
- 6418904
- Journal Information:
- J. Opt. Soc. Am.; (United States), Journal Name: J. Opt. Soc. Am.; (United States) Vol. 71:5; ISSN JOSAA
- Country of Publication:
- United States
- Language:
- English
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