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 experimental set-up of Lang and Sawyer [3] in three wavelength regions, 500 Å to 1500 Å, 1500 Å to 3200 Å, and 3200 Å to 7000 Å. The solid lines are polynomial least-squares fits to the data points (cubic for the first two regions, and quadratic for the last one).
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f4-jres.118.004: A logarithmic plot of the spectral sensitivity of experimental set-up of Lang and Sawyer [3] in three wavelength regions, 500 Å to 1500 Å, 1500 Å to 3200 Å, and 3200 Å to 7000 Å. The solid lines are polynomial least-squares fits to the data points (cubic for the first two regions, and quadratic for the last one).

Mentions: As noted in Sec. 2.5, Lang and Sawyer [3] used three different spectrographs, a 1 m vacuum grating spectrograph and two prism spectrographs, to photograph the spectrum between 500 Å and 8000 Å. They did not specify the spectral regions in which each of these spectrographs was used. However, by making Boltzmann plots similar to those described in the previous section it was possible to determine the effective temperature of their light source, Teff ≈ 2.5 eV, and divide the entire spectral range of their observations into three separate regions with distinctly different variation of spectral sensitivity. This division is illustrated in Fig. 4, which depicts the dependence of the logarithm of the ratio of observed and calculated intensities.


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 experimental set-up of Lang and Sawyer [3] in three wavelength regions, 500 Å to 1500 Å, 1500 Å to 3200 Å, and 3200 Å to 7000 Å. The solid lines are polynomial least-squares fits to the data points (cubic for the first two regions, and quadratic for the last one).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4-jres.118.004: A logarithmic plot of the spectral sensitivity of experimental set-up of Lang and Sawyer [3] in three wavelength regions, 500 Å to 1500 Å, 1500 Å to 3200 Å, and 3200 Å to 7000 Å. The solid lines are polynomial least-squares fits to the data points (cubic for the first two regions, and quadratic for the last one).
Mentions: As noted in Sec. 2.5, Lang and Sawyer [3] used three different spectrographs, a 1 m vacuum grating spectrograph and two prism spectrographs, to photograph the spectrum between 500 Å and 8000 Å. They did not specify the spectral regions in which each of these spectrographs was used. However, by making Boltzmann plots similar to those described in the previous section it was possible to determine the effective temperature of their light source, Teff ≈ 2.5 eV, and divide the entire spectral range of their observations into three separate regions with distinctly different variation of spectral sensitivity. This division is illustrated in Fig. 4, which depicts the dependence of the logarithm of the ratio of observed and calculated intensities.

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