MILLIMETER WAVE SPECTRA OF THE ALKALINE EARTH METAL OXIDES: BaO, SrO and CaO

The alkaline earth metal oxides BaO, SrO, and CaO have been produced in a gas phase flow system by the oxidation of the metal vapor, entrained in argon carrier gas, using oxygen or nitrous oxide. Rotational transitions have been measured for the isotopic species 138Ba16O, 88Sr16O, and 40Ca16O in the ground and first excited vibrational states of the X 1Σ electronic state in the region 80–220 GHz. In addition, ground vibrational transitions have been measured for the isotopic species 137Ba16O, 136Ba16O, 135Ba16O, and 87Sr16O, and 86Sr16O. The Dunham constants Y01, Y02, Y11, and Y12 have been determined from these measurements, and the vibrational constants Y10 and Y20 have been calculated. The following equilibrium internuclear distances have been derived: re(BaO) =1.939630(7) A, re(SrO) =1.919809(95) A, and re(CaO) =1.822203(68) A.

[1]  W. H. Hocking,et al.  Millimeter wave spectrum of CaO , 1977 .

[2]  W. D. Slafer,et al.  Chain reaction chemiluminescence of alkaline earth catalyzed N2O–CO flames , 1977 .

[3]  W. Duley.  Origin of the diffuse interstellar absorption bands , 1976 .

[4]  J. Gole,et al.  Chemiluminescence spectra of ScO and YO: Observation and analysis of the A′ 2Δ–X 2Σ+ band system , 1976 .

[5]  A. Dymanus,et al.  Microwave spectrum of potassium cyanide (KCN) , 1976 .

[6]  R. K. Sander,et al.  Crossed‐beam chemiluminescent studies of alkaline earth atoms with ClO2 , 1976 .

[7]  M. Menzinger,et al.  Molecular beam chemiluminescence. VII. Enhancement of Ba+N2O→BaO*+N2O cross section through N2O bending vibration: Evidence for electron transfer , 1975 .

[8]  R. Field,et al.  Photon yields of several reactions producing diatomic strontium oxide and halides, and SrO (A′ 1Π–X 1Σ): A new band system , 1975 .

[9]  F. D. Lucia,et al.  Millimeter- and submillimeter-wave spectrum and molecular constants of cuprous chloride , 1975 .

[10]  J. West,et al.  Flow system for the production of diatomic metal oxides and halides , 1975 .

[11]  T. Törring,et al.  Rotationsspektrum von BaO / Rotational Spectrum of BaO , 1974 .

[12]  G. Field.  Interstellar abundances - Gas and dust , 1974 .

[13]  T. Tsuji.  Molecular abundances in stellar atmospheres. II , 1973 .

[14]  T. Törring,et al.  Isotopieeffekte im Rotationsspektrum des SiS / lsotopic Effects in the Rotational Spectrum of SiS , 1972 .

[15]  P. Bunker.  On the breakdown of the Born-Oppenheimer approximation for a diatomic molecule , 1972 .

[16]  K. Rao,et al.  Molecular Spectroscopy: Modern Research , 1972 .

[17]  Walter Gordy,et al.  Microwave Molecular Spectra , 1970 .

[18]  E. F. Pearson,et al.  Millimeter- and Submillimeter-Wave Spectra and Molecular Constants of LiF and LiCl , 1969 .

[19]  L. Brewer,et al.  Near infrared bands of diatomic CaO and SrO , 1968 .

[20]  R. A. Brooks,et al.  Rotational Magnetic Moment of BaO , 1965 .

[21]  W. Klemperer,et al.  ELECTRONIC STRUCTURE OF SrO , 1965 .

[22]  W. Klemperer,et al.  Microwave Spectrum, Spectroscopic Constants, and Electric Dipole Moment of Li6F19 , 1963 .

[23]  W. Klemperer,et al.  Microwave Spectrum of BaO , 1963 .

[24]  W. Gordy,et al.  MILLIMETER WAVE MOLECULAR BEAM SPECTROSCOPY: ALKALI BROMIDES AND IODIDES , 1962 .

[25]  C. Townes,et al.  Isotopic Mass Ratios, Magnetic Moments and the Sign of the Electric Dipole Moment in Carbon Monoxide , 1958 .

[26]  R. F. Barrow,et al.  The Band-Spectrum of Barium Oxide , 1950 .

[27]  G. Herzberg,et al.  Spectra of diatomic molecules , 1950 .

[28]  A. Lagerqvist,et al.  Red Bands of MgO , 1949, Nature.

[29]  G. Almkvist,et al.  An Infra-Red Band System of SrO , 1949, Nature.

[30]  J. V. Vleck.  On the Isotope Corrections in Molecular Spectra , 1936 .

[31]  J. L. Dunham.  The Energy Levels of a Rotating Vibrator , 1932 .