The rotational spectrum of BiO radical in its X1 2Π1/2 and X2 2Π3/2 states

Near-infrared Fourier-transform and millimeterwave spectra of the BiS radical

“…The hyperfine splitting of BiS was 0.053 cm À1 for J = 36.5-35.5 and also J = 53.5-52.5. The splitting is slightly smaller than the value 0.059 cm À1 of BiO in the same J range [6]. For the fitting described below, 575 features of the 0.005 cm À1 resolution spectra were used and assigned an uncertainty of 0.0007 cm À1 .…”

“…BiS was produced in a flow system by heating Bi metal to 1120 K in an oven and reacting the Bi x vapor with a mixture of OCS or CS 2 and Ar in a DC discharge. Initially, the system was that used in the BiO study [6], but the signal was weak compared with that of BiO. Therefore we constructed a White-type multi-reflection cell as shown in Fig.…”

“…[6] that the calculated values for b F and c depend on assumptions one makes regarding c and the difference in nuclear spin rotation constants between the X 1 and X 2 states, DC I . Tamassia, et al [18] discuss the effects of assumptions involving c and A D on the hyperfine constants.…”

“…The BiO parameters presented here utilize the Ref. [6] data set, but are for the v = 0 state rather than the equilibrium parameters given previously. As was done for BiS, the calculation utilizes only DC I and does not determine b F and c.…”

“…In molecules, the effect must be considered when interpreting such quantities as the structure, dissociation energy, hyperfine constants, and magnetic shielding constants in nuclear magnetic resonance. Recently, Cohen et al [6] reported observation of the rotational spectrum of BiO in the X 1 2 P 1/2 , v 6 9 and X 2 2 P 3/2 , v 6 5 states which were analyzed along with spectra of the 0-0 and 1-1 bands of the X 2 ? X 1 spectrum previously reported by Shestakov, et al [7].…”