The vacuum ultraviolet spectrum of the bromine molecule

Venkateswarlu, Putcha (1969) The vacuum ultraviolet spectrum of the bromine molecule Canadian Journal of Physics, 47 (22). pp. 2525-2538. ISSN 0008-4204

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The absorption spectrum of bromine has been photographed in the first and higher orders of a 10.7-m. concave vacuum grating spectrograph in the region 1700-1170 Å .A number of band systems have been obtained in the region 1510-1170 Å , most of which correspond to Rydberg transitions. In addition, an extensive band system with closely-spaced bands degraded to longer wavelengths has been recorded in the region 1700-1500 Å . Among the Rydberg systems, five series have been found to converge to 85 165 ± 80 cm−1 which represents the ionization potential of the molecule leading to the 2Π 3/2g state of the molecular ion. They arise due to transitions from the ground state to [σ g2π u4π g32Π3/2g]npσ u, [σ g2π u4πg32Π3/2g]npπ u, [σ g2π u4π g32Π3/2g]nfσ u, [σ g2π u4π g32Π3/2g]nfπ u, and [σ g2π u4π g32Π3/2g]nfδ u configurations where n takes the running values 5, 6, 7, - etc. The first few members of four similar series corresponding to the transitions to the states involving the [σ g2π u4π g32Π1/2g] core have been identified and the ionization limit of these series is estimated to be at 88 306 ± 80 cm-1. Two of the remaining band systems have been found to be very likely due to transitions to the Rydberg states with the configurations [σ g2π u3π g42Π3/2u]5sσ g and [σ g2π u3π g42Π1/2u]5sσ g, respectively. Three of the observed systems which do not involve Rydberg states appear to have for their upper levels the 1Πu(1u), 3Π(1u), and 3Π(0u+) states arising from the configuration σ gπ u3π g4σ u2.

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