Ab initio multiconfiguration self-consistent-field calculations are reported for the potential curves and electronic wave functions of the states X 1Σ+, A 1Σ+, B 1Π, 3Σ+, and Π3 of LiH. In this calculation, the outer two electrons are correlated, while the 1σ shell, essentially a K shell on Li, is left uncorrelated. The obtained dissociation energies, with the known experimental values in parentheses, are De(X 1Σ+)=2.411(2.5154) eV, De(A 1Σ+)=1.048 (1.0765) eV, De(B 1Π)=0.017 (0.035) eV and De(3Π)=0.226 eV.

Measurement of the vibrational state dependence of the LiH A 1Σ+ dipole moment J. Chem. Phys. 73, 2049 (1980 10.1063/1.440425 Semirigorous bounds for the dipole moments and transition moments of the LiH molecule J. Chem. Phys. 69, 194 (1978); 10.1063/1.436384 Accurate dissociation energies from rotational predissociation and longrange forces: B 1Π LiHUsing accurate ab initio calculated potential curves and electronic wavefunctions for the states X 12;+, A 12;+, BIll, 32;+, and an for LiH, various properties were calculated. These include dipole and quadrupole moment, field gradient at the nuclei, etc. Rotation-vibrational wavefunctions were obtained and a rotationvibrational analysis was carried out. Some of the properties obtained were averaged over the appropriate rotation-vibrational wavefunctions. In addition electronic transition moments were computed and from this uv and ir line strengths were obtained. In general the agreement with experimental values, where available, is satisfactory.

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Dayglow radiation at 7319 Å has been measured by the visible airglow experiment on Atmosphere Explorer C. The overhead surface brightness measured at 15.4 hours local solar time on January 27, 1974, was 250 ± 10 R. The volume emission rate had a peak value of 20 photons cm−3 s−1 at a height of about 210 km. The data show clear evidence of quenching by collisions with thermal electrons at the higher altitudes and with neutral particles at lower altitudes. Quenching by neutral particles occurs at nearly the gas kinetic rate.