EMISSION OF $H_{2}O$ IN THE REGION $1.7-2.2 \mu$

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1951

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Ohio State University

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The emission of oxyhydrogen and oxyacetylene flames has been studied under high resolution with a 15,000-line grating spectrometer and lead sulfide cell. Slits as narrow as $0.2 cm^{-1}$ could be employed. The water-vapor band, which in room-temperature absorption extends from about $1.80-1.96 \mu$, is broadened in emission from $1.7-2.2\mu (5000-4550 cm^{-1})$. Over 600 strong lines have been measured in this region, and a number of weaker, partially resolved lines appear reproducibly. The analysis of the rotational structures is progressing. Many lines of the (011-000) band agree with those found in laboratory and atmospheric $absorption,^{1}$ when allowance is made for the greatly increased effective temperature, and many additional lines from higher energy levels may be identified. The principal series $J_{-J} \longleftrightarrow (J+1)_{-(J+1)}$ may be followed out to $J^{\prime} = 22$ in both the P and R branches. Corresponding, lines in the upper-state bands (021-010) and (031-020) have also been identified with somewhat lower intensity, and a few lines may be assigned to the (041-030), (111-100), and (012-001) bands.

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$^{1}$ R. C. Nelson and W. S. Benedict, Phys. Rev. 74, 703 (1948)
Author Institution: National Bureau of Standards

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