High-resolution spectra of the¹⁰B¹⁸O and ¹¹B¹⁸O: Rotational analysis of the B-X bands

Abstract

Emission spectra of 10B18O and 11B 18O isotopomers in the 230-330nm region have been investigated by means of conventional high-resolution spectroscopy. The molecules were produced in a low-pressure arc by discharging 8 Torr of mixture containing argon and oxygen 18 in the ratio of 4:1 and the spectra have been recorded using Ebert-type spectrograph. The boron needed to produce BO has been present in the system as amorphous powder with natural abundance of 10B and 11B. Rotational analysis of the 0, 0 and 0, 1 bands has been performed and spectroscopic constants have been extracted. The results have allowed first determination of the equilibrium rotational constants B e, and D e for both isotope species 10B 18O and 11B18O in their lower electronic state. Assuming a linear dependence of Be on (v + 1/2), the value of equilibrium distance re in the lower state has been derived. © 2005 Chinese Physical Society and IOP Publishing Ltd.