MARVEL analysis of high-resolution rovibrational spectra of 17O13C18O and 17O13C17O

Spectroscopic networks, based on rovibrational line-center measurements found in 10/5 literature sources, are presented for the triply substituted carbon dioxide isotopologues 17 O 13 C 18 O / 17 O 13 C 17 O (738/737, according to a well-established shorthand notation followed in this study). For 738/737, the spectroscopic networks contain 2058(1488)/1831(1349) measured(unique) transitions, belonging to 25/22 vibrational bands. The transitions collected for 738 and 737 span the wavenumber regions 623 − 7888 and 624 − 6739 cm − 1 , respectively. These spectroscopic networks determine 945 and 877 empirical rovibrational energy levels for 738 and 737, respectively, extracted with the help of the MARVEL (Measured Active Rotational–Vibrational Energy Levels) protocol and code. The energy levels of 738/737 span the range of 0 − 8762 / 0 − 7201 h c cm − 1 and the polyads from 0 to 11 for 738 and from 0 to 10 for 737. A detailed comparison of the empirical rovibrational energy levels of this study with their counterparts in two published databases, CDSD-296, and Ames-2021, shows very good overall agreement. • Analyzed transitions for two triply-substituted isotopologues of CO 2 molecule. • Used MARVEL to derive 945 and 877 rovibrational levels for two rare CO 2 forms. • This work completes empirical energy levels for all CO 2 isotopologues.