Leonid A. Kaledin, John E. McCord, and Michael C. Heaven, "Laser spectroscopy of LaF: ligand field-theory assignment of the triplet-state manifold and analysis of hyperfine structure," J. Opt. Soc. Am. B 11, 219-224 (1994)
Wavelength-resolved fluorescence excitation techniques have been used to record eight electronic transitions of LaF at a resolution of 0.03 cm−1. With few exceptions, Ω assignments were unambiguously determined from observations of the first lines in at least two rotational branches. Accurate term energies and rotational constants are reported. Ligand field-theory calculations and hyperfine constants were used to suggest configurational assignments for the excited states of LaF.
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Uncertainties (1σ) are in the units of the last significant figure. z = 1432(3) cm−1.2,3
Ref. 1.
ΔG1/2 = 538.94(1); B1 = 0.237543(5); D1 = 2.0 × 10−7 (fixed).
ΔG1/2 = 537.61(1); B1 = 0.237056(8); D1 = 1.823(9) × 10−7.
ΔG1/2 = 537.33; from Ref. 1.
The energy zero was taken to be the a3Δ1 state extrapolated to the J = 0 level with the hyperfine parameters set equal to zero.
Table 2
Ligand Field-Theory Model for La+(5d6s)F−: Calculated Energies and Eigenvectors for the a3Δ and A′ 1Δ Statesa
These calculations were performed with the coupled basis functions |La, Sa, Ja, Ω〉. ζ(5d) = 416(9) cm−1; G2(5d, 6s) = 1723(10) cm−1; B02(5d) = 7600 cm−1; B04(5d) = 2660 cm−1. Uncertainties (1σ) are in the units of the last significant figure.
Refs. 2 and 3.
Fitted parameters from Eq. (6): a5d = 4 × 10−3 cm−1 and b6s = 0.108 cm−1.
To facilitate calculation of the angular factors we give the eigenvectors here in terms of the uncoupled basis functions.
Tables (3)
Table 1
Constants for LaF Derived from Laser Excitation Spectra (cm−1)a
Uncertainties (1σ) are in the units of the last significant figure. z = 1432(3) cm−1.2,3
Ref. 1.
ΔG1/2 = 538.94(1); B1 = 0.237543(5); D1 = 2.0 × 10−7 (fixed).
ΔG1/2 = 537.61(1); B1 = 0.237056(8); D1 = 1.823(9) × 10−7.
ΔG1/2 = 537.33; from Ref. 1.
The energy zero was taken to be the a3Δ1 state extrapolated to the J = 0 level with the hyperfine parameters set equal to zero.
Table 2
Ligand Field-Theory Model for La+(5d6s)F−: Calculated Energies and Eigenvectors for the a3Δ and A′ 1Δ Statesa
These calculations were performed with the coupled basis functions |La, Sa, Ja, Ω〉. ζ(5d) = 416(9) cm−1; G2(5d, 6s) = 1723(10) cm−1; B02(5d) = 7600 cm−1; B04(5d) = 2660 cm−1. Uncertainties (1σ) are in the units of the last significant figure.
Refs. 2 and 3.
Fitted parameters from Eq. (6): a5d = 4 × 10−3 cm−1 and b6s = 0.108 cm−1.
To facilitate calculation of the angular factors we give the eigenvectors here in terms of the uncoupled basis functions.
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