12C 16O 2: A Set of Spectroscopic Constants from a Simultaneous Treatment of Rovibrational Bands at 4.5 and 15 μM

Abstract

A set of spectroscopic constants has been obtained using a single weighted least-squares fit involving simultaneously the experimental wavenumbers of the rovibrational lines of 12C16 2 observed at 15 μm and at 4.5 μm, as well as the "laser difference wavenumbers." One hundred thirty-two spectroscopic constants corresponding to 57 vibrational levels or sublevels v 1 v l 2 v 3 [(2 v 1 + v 2) ≤ 4, v 3 ≤ 2] and 51 band centers, have been determined from 4132 observed rovibrational lines, 72 "laser difference wavenumbers," and 40 rovibrational lines belonging to the laser hot band transition 01 11 → (11 1) 1, and are reproduced within the respective experimental precisions: typically some 10 −7 cm −1 for laser transitions, some 10 −5 cm-1 for 4.5-μm transitions, and some 10 −4 cm −1 for 15-μm transitions.