The Role of the Hyperfine Structure for the Determination of Improved Level Energies of Ta II, Pr II and La II

Abstract

For the determination of improved energy levels of ionic spectra of elements with large values of nuclear magnetic dipole moment (and eventually large values of nuclear quadrupole moments), it is necessary to determine the center of gravity of spectral lines from resolved hyperfine structure patterns appearing in highly resolved spectra. This is demonstrated on spectral lines of Ta II, Pr II and La II. Blend situations (different transitions with accidentally nearly the same wave number difference between the combining levels) must also be considered.

Optogalvanic spectroscopy of the hyperfine structure of the 5p65d 2D3/2,Olmschenk1, Banner2, Hankes3 et al. 2017Phys. Rev. A3040View full textAdd to dashboardCite

“…The hyperfine structure of singlyionized lanthanum has been investigated with a range of techniques [11,12], including experimental observations using grating spectroscopy [13], interferometry [14], collinear ion-beam-laser spectroscopy [15][16][17][18], Fourier transform spectroscopy [2,19], a laser and radiofrequency double resonance technique [20], and laser-induced fluorescence [21][22][23], as well as theoretical calculations using a classical parametric scheme [24], a relativistic configuration-interaction method [25], and a semiempirical method [21,22]. Although many of the parameters for doubly-ionized lanthanum (La III; La 2+ ) also have been investigated experimentally [26][27][28][29][30][31][32][33][34][35] and theoretically [6,[36][37][38][39][40][41][42], the hyperfine structure of La 2+ is known for only a few energy levels.…”

Optogalvanic spectroscopy of the hyperfine structure of the $5p^65d$ ${}^2D_{3/2,5/2}$ and $5p^64f$ ${}^2F^o_{5/2,7/2}$ levels of La III

“…The atomic structure of lanthanum ions is of interest to astrophysical measurements of stellar composition [1][2][3][4], appraisals of atomic structure calculations for atomic clocks and variations of fundamental constants [5][6][7][8], measurements of parity nonconservation [9], and a proposal for laser cooling and quantum information [10]. The hyperfine structure of singlyionized lanthanum has been investigated with a range of techniques [11,12], including experimental observations using grating spectroscopy [13], interferometry [14], collinear ion-beam-laser spectroscopy [15][16][17][18], Fourier transform spectroscopy [2,19], a laser and radiofrequency double resonance technique [20], and laser-induced fluorescence [21][22][23], as well as theoretical calculations using a classical parametric scheme [24], a relativistic configuration-interaction method [25], and a semiempirical method [21,22]. Although many of the parameters for doubly-ionized lanthanum (La III; La 2+ ) also have been investigated experimentally [26][27][28][29][30][31][32][33][34][35] and theoretically [6,[36][37]…”