Abstract

The strengths and half-widths of lines in the R branch of the CO fundamental band at temperatures as low as 113 K have been determined from equivalent-width measurements in the linear and square-root regions of the curve of growth. For all temperatures, the observed line strengths are in excellent agreement with line strengths calculated on the basis of the Herman–Wallis expression. However, at the lowest temperatures the observed half-widths differ considerably from the values calculated on the basis of the usual extrapolations of room-temperature data; the half-widths of lines near the band center are much larger than the calculated half-widths, and the half-widths of lines in the band wing are apparently considerably smaller than the calculated half-widths.

© 1969 Optical Society of America

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