# VIBRATIONAL NUMBERING OF THE $A^{2}\Pi(l_{u})$ STATE OF BROMINE

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 Title: VIBRATIONAL NUMBERING OF THE $A^{2}\Pi(l_{u})$ STATE OF BROMINE Creators: Clyne, M. A. A.; Coxon, John A. Issue Date: 1970 Publisher: Ohio State University Abstract: The electronic absorption spectrum of bromine at wavelengths above 5100 {\AA} consists of two band systems, B $^{2}\Pi_{o^{+}_{u}}\leftarrow X^{1}\Sigma^{+}_{g}$ and A $^{2}\Pi_{o_{u}}\leftarrow X^{1}\Sigma^{+}_{g}$. The intense $B\leftarrow X$ system has been studied in $detail^{1, 2, 4}$. For the weaker, `extreme-red’. $A\leftarrow X$ System, only vibrational analyses by Brown’ and $Darbyshire^{3}$, and the analyses of a few bands of $^{10-81} Br_{2}$ at high $resolution^{4}$ have been reported. The vibrational numbering of the A $^{3}\Pi_{1u}$, state of bromine has therefore remained uncertain. We have analysed several bands of $^{70} Br_{2}$ and $^{81} Br_{2}$ ($A\leftarrow$X) at high resolution, using a 6 m absorption cell. Accurate data for the rotational constants and band origins have been measured for both isotopes, and the vibrational numbering of the A $^{3}\Pi_{1_{u}}$ state has been unequivocally determined. It is necessary to increase $Brown’s^{4}$ provisional numbering for this state by 7 units. Description: $^{1}$W. G. Brown, Phys. Rev. 59, 777 (1932). $^{2}$J. A. Horsley and R. F. Barrow, Trans, Faraday Soc. 68, 32 (1967). $^{3}$J. A. Conon, submitted for publication, J. Molec, Spec, (1970). $^{4}$W. G. Brown, Phys, Rev. 38, 1179 (1931). $^{5}$O. Darbyshire, Proc, Roy, Soc., London, Ser. A. 159, 93 (1937). $^{6}$J. A. Horsley, J. Molec. Spec, 28, 169 (1967)."" Author Institution: Department of Chemistry, Queen Mary College URI: http://hdl.handle.net/1811/8627 Other Identifiers: 1970-Z-9