Hyperfine Structure in the Arc Spectrum of Bromine

Abstract

IN a recent publication¹ we showed that the deviation from the interval rule in the 5s⁴P_5/2 term of the BrI spectrum fits quite well the quadratic interaction formula E = α₀ + ½αC + bC(C + 1), which arises when the nucleus has an electrical quadrupole moment. We have detected an arithmetical error in our calculations, and when the correction is made, the fit is even better than that previously reported. Thus the two independent check values for the constant b are now 0˙175 and 0˙170 (formerly 0˙175 and 0˙161), leading to two independent values for α which are 47˙14 and 47˙10 (units are cm.^-1 × 10^-3). The corrected interaction formula now becomes E = 230˙1 + ½ 47˙12C + 0˙172C(C + 1).