The infrared spectrum of barium oxide in the gas phase

• Published in: Journal of molecular spectroscopy Vol. 140; no. 1; pp. 103 - 111
• Main Authors: Hedderich, Hartmut G., Blom, Cornelis E.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01.03.1990; Elsevier
• Subjects: Atomic and molecular physics; Exact sciences and technology; Molecular properties and interactions with photons; Physics; Properties of molecules and molecular ions; Rotation, vibration and vibration-rotation constants; Hot band; Dunham coefficient; Rotational constant; Instrumentation; Centrifugal distortion constant; Experimental study; Rotational analysis; Inorganic compound; Diatomic molecule; Barium Oxides; Isotope effect; Rovibrational transition; Laser beam; Gaseous state; Molecular constant; Infrared spectrum
• ISSN: 0022-2852; 1096-083X
• DOI: 10.1016/0022-2852(90)90009-F

The high-resolution infrared spectrum of barium oxide has been observed in a low-pressure flame by reacting hot barium vapor with nitrous oxide. A total of 140 rovibrational transitions of the five most abundant isotopic species have been detected with a tunable diode laser flame spectrometer. For the main species, 138BaO, 53 lines have been assigned to rovibrational transitions of the v = 1 ← 0 to v = 6 ← 5 bands. The new infrared data have been combined with previous microwave and millimeter-wave transition frequencies from the literature to yield precise Dunham coefficients for the X 1Σ + electronic ground state of BaO.