Limits...
Critically Evaluated Energy Levels and Spectral Lines of Singly Ionized Indium (In II).

Kramida A - J Res Natl Inst Stand Technol (2013)

Bottom Line: Uncertainties of the energy level values have been reduced by an order of magnitude.An improved value of the ionization limit of In II has been determined by fitting quantum-defect and polarization formulas for several series of levels.The hyperfine structure interval in the 5s (2)S ground state of In III has been determined from the measurements of the 5sng and 5snh series in In II.

View Article: PubMed Central - PubMed

Affiliation: National Institute of Standards and Technology, Gaithersburg, MD 20899.

ABSTRACT
A comprehensive list of the best measured wavelengths in the In II spectrum has been compiled. Uncertainties of the wavelength measurements have been analyzed, and existing inconsistencies have been resolved. An optimized set of fine-structure energy levels that fits all observed wavelengths has been derived. Uncertainties of the energy level values have been reduced by an order of magnitude. An improved value of the ionization limit of In II has been determined by fitting quantum-defect and polarization formulas for several series of levels. Intensities of lines observed by different authors have been analyzed and converted to a uniform scale. A set of recommended values of radiative transition rates has been critically compiled, and uncertainties of these rates have been estimated. The hyperfine structure interval in the 5s (2)S ground state of In III has been determined from the measurements of the 5sng and 5snh series in In II.

No MeSH data available.


Related in: MedlinePlus

A logarithmic plot of the spectral sensitivity of single-prism observations of Paschen and Campbell [2] against wavelength. The solid line is a linear least-squares fit to the data points.
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f1-jres.118.004: A logarithmic plot of the spectral sensitivity of single-prism observations of Paschen and Campbell [2] against wavelength. The solid line is a linear least-squares fit to the data points.

Mentions: The analysis of line intensities reported by Paschen and Campbell [2] is complicated due to the large number of different registration methods used. The analysis is simplest for the observations made with the single-prism spectrograph. These observations span the wavelength region between 2100 Å and 6630 Å, but most of them are below 2700 Å. The intensities reported by Paschen and Campbell are visual estimates of blackening of photographic plates; hence, they are non-linear in response to exposure. This non-linearity should be removed together with the wavelength dependence of the sensitivity. This was done in an iterative procedure, which resulted in an effective temperature Teff ≈ 3.4 eV. The spectral variation of the sensitivity can be visualized by plotting the logarithm of the ratio of calculated and observed intensities Iobs/Icalc, where Icalc is set to equal the right side of Eq. (4), against wavelength. This plot for the single-prism observations is presented in Fig. 1.


Critically Evaluated Energy Levels and Spectral Lines of Singly Ionized Indium (In II).

Kramida A - J Res Natl Inst Stand Technol (2013)

A logarithmic plot of the spectral sensitivity of single-prism observations of Paschen and Campbell [2] against wavelength. The solid line is a linear least-squares fit to the data points.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4487322&req=5

f1-jres.118.004: A logarithmic plot of the spectral sensitivity of single-prism observations of Paschen and Campbell [2] against wavelength. The solid line is a linear least-squares fit to the data points.
Mentions: The analysis of line intensities reported by Paschen and Campbell [2] is complicated due to the large number of different registration methods used. The analysis is simplest for the observations made with the single-prism spectrograph. These observations span the wavelength region between 2100 Å and 6630 Å, but most of them are below 2700 Å. The intensities reported by Paschen and Campbell are visual estimates of blackening of photographic plates; hence, they are non-linear in response to exposure. This non-linearity should be removed together with the wavelength dependence of the sensitivity. This was done in an iterative procedure, which resulted in an effective temperature Teff ≈ 3.4 eV. The spectral variation of the sensitivity can be visualized by plotting the logarithm of the ratio of calculated and observed intensities Iobs/Icalc, where Icalc is set to equal the right side of Eq. (4), against wavelength. This plot for the single-prism observations is presented in Fig. 1.

Bottom Line: Uncertainties of the energy level values have been reduced by an order of magnitude.An improved value of the ionization limit of In II has been determined by fitting quantum-defect and polarization formulas for several series of levels.The hyperfine structure interval in the 5s (2)S ground state of In III has been determined from the measurements of the 5sng and 5snh series in In II.

View Article: PubMed Central - PubMed

Affiliation: National Institute of Standards and Technology, Gaithersburg, MD 20899.

ABSTRACT
A comprehensive list of the best measured wavelengths in the In II spectrum has been compiled. Uncertainties of the wavelength measurements have been analyzed, and existing inconsistencies have been resolved. An optimized set of fine-structure energy levels that fits all observed wavelengths has been derived. Uncertainties of the energy level values have been reduced by an order of magnitude. An improved value of the ionization limit of In II has been determined by fitting quantum-defect and polarization formulas for several series of levels. Intensities of lines observed by different authors have been analyzed and converted to a uniform scale. A set of recommended values of radiative transition rates has been critically compiled, and uncertainties of these rates have been estimated. The hyperfine structure interval in the 5s (2)S ground state of In III has been determined from the measurements of the 5sng and 5snh series in In II.

No MeSH data available.


Related in: MedlinePlus