Venkateswarlu, Putcha
(1970)
*Vacuum ultraviolet spectrum of the iodine molecule*
Canadian Journal of Physics, 48
(9).
pp. 1055-1079.
ISSN 0008-4204

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Official URL: http://www.nrcresearchpress.com/doi/abs/10.1139/p7...

Related URL: http://dx.doi.org/10.1139/p70-136

## Abstract

The absorption spectrum of iodine has been photographed in the higher orders of a 10.7 m concave grating spectrograph in the region 1950-1200 Å . A number of band systems has been obtained, most of which correspond to Rydberg
transitions. The limit of the Rydberg series leading to the ^{2}Π _{3/2g} state of the molecular ion has been recorded and the corresponding ionization potential is found to be 75 814 ± 10 cm^{−1}. Five series have been found which terminate at this common limit. They represent transitions from the ground state to [σ _{g}^{2}π _{u}^{4}Π_{g}^{32}Π_{3/2g}]np
σ_{u} Π_{1u}, [σ _{g}^{2}π _{u}^{4}π _{g}^{32}Π_{3/2g}]np π _{u} Σ ^{+} (0_{u}^{+}), [σ _{g}^{2}π _{u}^{4}π _{g}^{32}Π_{3/2g}]nf σ _{u} Π_{1u}, [σ _{g}^{2}π _{u}^{4}π _{g}^{32}Π_{3/2g}]nf π _{u}, Σ ^{+}(0_{u}^{+}), and [σ _{g}^{2}π _{u}^{4}π _{g}^{32}Π_{3/2g}]nf δ _{u} Π_{1u} states respectively, where n takes the running values 6, 7, 8, - etc. for the first
three series and 4, 5, 6, - etc. for the last two series. The series limit of the bands corresponding to the molecules with ν " = 1 has been found to be at 75 600 ± 10 cm^{−1}. The first few members of similar series corresponding to transitions to different states involving the common [σ _{g}^{2}π
_{u}^{4}π _{g}^{32}Π_{1/2g}] core have been identified and the ionization limit of these series is estimated to be at 80 895 ± 50 cm^{−1}. Some of the remaining band systems obtained have been found to be very likely due to transitions to the Rydberg states involving molecular ion cores like [σ _{g}^{2}π _{u} 3π _{g}^{42}Π_{3/2u}], [σ _{g}^{2}π _{u}^{3}π _{g}^{42}Π_{1/2u}], and [σ _{g}^{2}π _{u}^{4}π _{g}^{2}σ _{u}^{2}Σ _{u}^{+}]. Three of the observed band systems do not appear to involve Rydberg states and their upper levels are very likely the ^{1}Π(1_{u}), ^{3}Π(1_{u}), and ^{3}Π(0_{u}^{+}) states arising from the configuration σ _{g}π _{u}^{3}π _{g}^{4}σ _{u}^{2}. The positions of these levels are at 64 956, 62 844, and 61 847 cm^{−1}, the corresponding vibrational frequencies being 145, 144, and 109 cm^{−1} respectively.

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Deposited On: | 02 Nov 2011 10:50 |

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