An electrodeless discharge lamp (E. D. L.) of phosphorus monoxide was developed. The E. D. L. containing a trace of oxygen and 6 Torr of phosphorus vapor was ignited by a high frequency of 27 MHz and 55 watt. Emission spectra of P and PO were measured in 200-360 nm wavelength range. Two bands of the PO molecule were found, one is the β system extending from 320 to 360 nm, and the other is γ system extending from 230 to 280 nm. The emission spectra of PO was observed also in air-acetylene flame. The determination of phosphorus by atomic and molecular absorption spectrometry was done in the wavelength range of 200-360 nm using nitrous oxide-acetylene and air-acetylene flames. Detection limit by the molecular absorption of PO in air-acetylene flame was 82 μg/ml at 246 nm, and in case of phosphorus resonance line at 213.6 nm, in nitrous oxide-acetylene flame it was 64 μg/mi. The detection limit by the emission spectrum of air-acetylene flame was 40 μg/ml at 246.3 nm in PO molecular band.

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Raman scattering intensities of the C=O stretching vibration were measured for about sixty compounds. The intensities were determined relative to that of the C=C stretching, vibration of tetrachloroethylence. The obtained data were examined in view of the applications of them to the group type analysis. It was shown that the Raman intensities are constant for each of the types of compounds such as aliphatic esters, acrylates and metha crylates, aromatic esters, etc., and they are remarkably different among those types, while the corresponding infrared absorption intensities are kept constant over much wider range of compounds. The results indicate that when the conjugation effect including the C=O group exists, the marked enhancement of the Raman intensities is realized. These results suggest that the intensities of the νc=o bands have the possible utility for the determinations of the types of carbonyl compounds. Moreover, it was proved that the intensities are proportional to the numbers of C=O groups in a molecule within the same types of compounds. It was concluded that the obtained results give a useful guide to the group type analysis by Raman spectrometry.

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