Vacuum ultraviolet spectrum of the iodine molecule

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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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 2Π 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 g2π u4Πg32Π3/2g]np σu Π1u, [σ g2π u4π g32Π3/2g]np π u Σ + (0u+), [σ g2π u4π g32Π3/2g]nf σ u Π1u, [σ g2π u4π g32Π3/2g]nf π u, Σ +(0u+), and [σ g2π u4π g32Π3/2g]nf δ u Π1u 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 g2π u4π g32Π1/2g] 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 g2π ug42Π3/2u], [σ g2π u3π g42Π1/2u], and [σ g2π u4π g2σ u2Σ u+]. Three of the observed band systems do not appear to involve Rydberg states and their upper levels are very likely the 1Π(1u), 3Π(1u), and 3Π(0u+) states arising from the configuration σ gπ u3π g4σ u2. 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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