The scattered light of solar radiance near the infrared ray area was observed to measure H2O and O2 absorption lines. The changes of H2O and O2 equivalent width were calculated on the basis of the measurement. O2 equivalent width showed negative correlation with the amount of solar radiance; O2 equivalent width had a tendency to diminish as the amount of the solar radiance increased and to increase as the amount of the solar radiance decreased. On the other hand, H2O equivalent width showed the positive correlation with the amount of solar radiance. Especially it was noted that the sum of equivalent width of absorption lines created by H2O and O2 in a day was fairly constant. It is implied that the constant equivalent width is caused by the complementary development of photodissociation and recombination in O2 and H2O.

The experimental techniques for obtaining spectra of triatomic hydrogen are described with special reference to studies in the infrared. An electronic transition near 3600 cm−1 is observed in both H3 and D3. Its analysis shows that it is a 2A1′–2E′ transition and that the upper state is identical with the upper state 3s2A1′ of the 6025 Å band previously analysed (I. Dabrowski and G. Herzberg. Can. J. Phys. 58, 1238 (1980)) while the lower state is the upper state 3p2E′ of the 7100 Å band (G. Herzberg and J. K. G. Watson. Can. J. Phys. 58, 1250 (1980)). Improved constants are obtained for both these states from the infrared bands of H3 and D3. Perturbations in the upper state 3s2A1′ of D3 are clarified.

The A2Σ+–X2Π emission spectrum of HF+, between 3580 and 4830 Å, has been photographed at high resolution and measurements on eight bands are reported. The analysis yields rotational and vibrational constants of the X state for ν = 0 to 2 and of the A state for ν = 0 to 3. A predissociation by rotation in the A2Σ+ state is observed and yields a dissociation energy of 3203 ± 50 cm−1 above the ν = 0, N = 0 level of this state. It is shown that this corresponds to a dissociation into H+(1S) + F(2P1/2). A detailed comparison with previous results obtained from photoelectron and photoionization experiments and from recent theoretical calculations is given.

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RADIATION 641quenching cross section of such gases as CO, NO, H 2 , or O2. With these gases, the pressure broadening correction would be negligible since a measurable quenching effect is produced at much lower gas pressures. Moreover, for the gases H 2 and 0 2 the difficulty arising from the presence of the band fluorescence would be very much reduced. In these cases the quenching processes * First reported as an abstract in