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

Near-infrared electronic spectra of BiSe

“…As expected from the theoretical predictions [6], the electronic states and spectra of BiSe show great similarity to those of the previously studied BiO [1] and BiS [2,3] radicals. In all three molecules, the most prominent transitions are the X 2 2 P 3/2 ?…”

“…2 shows close-ups of the Dv = 0 sequence of the fine structure transition at a resolution of 0.1 cm À1 measured with Ar (a) and He (b) carrier gas. As was found in the analogous transitions of BiO [1] and BiS [2], with He carrier gas the vibrational population in the X 2 state is somewhat more relaxed. Six bands, 0-0 to 5-5, are identified.…”

“…The experimental setup and procedures used for measuring the NIR/VIS emission spectra of BiSe have been described in previous work on BiO [1] and BiS [2,3]. Chemiluminescence from the Bi x /Se x /O 2 (a 1 D g ) system was measured with a high-resolution Fourier-transform spectrometer (Bruker IFS 120 HR) equipped with a liquid-nitrogen cooled Ge detector (Applied Detector Corp. Model 403 S) or a photomultiplier (Hamamatsu type R 928 or R 666-10).…”

“…Consequently, all vibrational bands are superpositions of six isotopic bands and the determination of band origins from the mediumresolution spectra is difficult. For the 0-0 band, the vibrational isotope splitting is small and from computer simulations of the 0-0 bands of BiO [1] and BiS [2] it is known that the origin lies in the minimum between the two maxima of the band. The band forms of the weak Dv = À1 bands are complicated and no reliable information about band origins can be deduced.…”

“…In previous work, we have reported on detailed measurements of the NIR/VIS emission spectra of the bismuth chalcogenide radicals BiO [1] and BiS [2,3]. These molecules exhibit X 2 P r ground states with large spin-orbit splittings of 7087 and 6903 cm À1 , respectively, and therefore can be efficiently excited by E ?…”