High resolution Fourier transform spectra of the 1.3-μm emission from 127I and 129I electrodeless discharge lamps are presented and analyzed. The hyperfine splitting constants of 129I are: A = 18.35 ± 0.01 mK and B = 26.55 ± 0.07 mK for the J = 3/2 ground state and A = 146.32 ± 0.02 mK for the J = 1/2 excited state. The validity of the theoretical intensity and isotope relationships is confirmed. The isotope shift between 129I and 127I for the 1.3-μm transition was measured to be <1 mK.
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All splitting constants given in units of mK (0.001 cm−1). T0 given in vacuum wave numbers (cm−1).
Centroid calculation gave 7602.9755 cm−1 for T0.
Centroid calculation gave 7602.9754 cm−1 for T0.
Calculated from Ref. 3 splitting constants and the constants in Eq. (3).
Table III
Comparisons of Relative Intensities for Iodine Lines
Sum of intensities for (2-3), (2-2), and (2-1) transitions.
Sum of intensities for (3-4), (3-3), and (3-2) transitions.
Sum of intensities for (4-5), (4-4), and (4-3) transitions.
Relative intensities from integration of filtered spectra of Fig. 2. Only the ratio of the theoretical and measured intensities, and not their magnitudes, is of significance.
Table IV
Calculated Wave Numbers and Intensities for Hyperfine Components of the Iodine 1.3-μm Transition
Vacuum wave numbers (cm−1) calculated from constants in Table II.
Theoretical intensities normalized to the strongest 127I component. The sum of 129I intensities were made equal to the sum of the 127I intensities.
All splitting constants given in units of mK (0.001 cm−1). T0 given in vacuum wave numbers (cm−1).
Centroid calculation gave 7602.9755 cm−1 for T0.
Centroid calculation gave 7602.9754 cm−1 for T0.
Calculated from Ref. 3 splitting constants and the constants in Eq. (3).
Table III
Comparisons of Relative Intensities for Iodine Lines
Sum of intensities for (2-3), (2-2), and (2-1) transitions.
Sum of intensities for (3-4), (3-3), and (3-2) transitions.
Sum of intensities for (4-5), (4-4), and (4-3) transitions.
Relative intensities from integration of filtered spectra of Fig. 2. Only the ratio of the theoretical and measured intensities, and not their magnitudes, is of significance.
Table IV
Calculated Wave Numbers and Intensities for Hyperfine Components of the Iodine 1.3-μm Transition
Vacuum wave numbers (cm−1) calculated from constants in Table II.
Theoretical intensities normalized to the strongest 127I component. The sum of 129I intensities were made equal to the sum of the 127I intensities.
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