Bartley L. Cardon, W. H. Parkinson, and F. S. Tomkins, "Oscillator strengths of neutral yttrium (Y i) from hook-method measurements in a furnace," J. Opt. Soc. Am. 70, 1372-1375 (1980)

Relative oscillator strengths for 33 neutral yttrium (Y i) transitions between 2723 and 4761 Å have been measured by the hook method. The data have been analyzed and placed on an absolute scale by using a numerical procedure developed by Cardon, Smith, and Whaling and the published absolute lifetimes of Beer, and Andersen, Ramanujam, and Bahr. The
$z{2_{F}}_{5/2}^{\xb0}$ level lifetime of Beer is found to be in error. The absolute lifetime of the level
$y{2_{P}}_{3/2}^{\xb0}$ is determined to be 36 ± 4 ns. The total uncertainties in the absolute oscillator strengths are between 9% and 14%.

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Absolute gf values for 33 Y i transitions. In column 1 are the transition wavelengths in air. Columns 2 and 3 list the lower and upper energy-level designations. In column 4 are the number of measurements. Column 5 lists the relative log_{10}gf values obtained by the hook method. In column 6 are the observed branching ratios (
${\mathcal{R}}_{B}$ in percent). Column 7 contains optimum relative gf values,
$g\widehat{f}$, obtained from log_{10}gf and
${\mathcal{R}}_{B}$ by the least-squares program snap. Columns 8 and 9 list the absolute gf values, expressed as log_{10}gf_{norm}, and the fractional uncertainties. Column 10 contains gf values of Corliss and Bozman (Ref. 8).

Relative lifetimes,
$\widehat{\tau}$, derived from the least-squares program snap. In column 1 is the upper-level designation. Column 2 lists
$\widehat{\tau}$ and its uncertainty. Absolute experimental lifetimes, and their uncertainties, of Beer (Ref. 6) and Andersen et al. (Ref. 7) are in column 3. The ratio of our derived relative lifetimes to the absolute experimental lifetimes are in column 4. The mean of these ratios, 1.09 ± 0.09, is used to normalize
$g\widehat{f}$ in column 7 of Table I, which in turn are used to place all our relative
$g\widehat{f}$ values, log_{10}gf, on an absolute scale. The normalized lifetime for
$y{2_{P}}_{3/2}^{\xb0}$ is 36 ± 4 ns.

Ref. 6. Ref. 7.
The uncertainty in the Andersen et al.7 lifetime has been increased to ±20%.

Tables (2)

TABLE I

Absolute gf values for 33 Y i transitions. In column 1 are the transition wavelengths in air. Columns 2 and 3 list the lower and upper energy-level designations. In column 4 are the number of measurements. Column 5 lists the relative log_{10}gf values obtained by the hook method. In column 6 are the observed branching ratios (
${\mathcal{R}}_{B}$ in percent). Column 7 contains optimum relative gf values,
$g\widehat{f}$, obtained from log_{10}gf and
${\mathcal{R}}_{B}$ by the least-squares program snap. Columns 8 and 9 list the absolute gf values, expressed as log_{10}gf_{norm}, and the fractional uncertainties. Column 10 contains gf values of Corliss and Bozman (Ref. 8).

Relative lifetimes,
$\widehat{\tau}$, derived from the least-squares program snap. In column 1 is the upper-level designation. Column 2 lists
$\widehat{\tau}$ and its uncertainty. Absolute experimental lifetimes, and their uncertainties, of Beer (Ref. 6) and Andersen et al. (Ref. 7) are in column 3. The ratio of our derived relative lifetimes to the absolute experimental lifetimes are in column 4. The mean of these ratios, 1.09 ± 0.09, is used to normalize
$g\widehat{f}$ in column 7 of Table I, which in turn are used to place all our relative
$g\widehat{f}$ values, log_{10}gf, on an absolute scale. The normalized lifetime for
$y{2_{P}}_{3/2}^{\xb0}$ is 36 ± 4 ns.