High-Temperature Infrared Measurements in the Region of the Bending Fundamental of H¹²C¹⁴N, H¹²C¹⁵N, and H¹³C¹⁴N

Author： Maki A.G. Mellau G.C. Klee S. Winnewisser M. Quapp W.

ISSN： 0022-2852

Source： Journal of Molecular Spectroscopy, Vol.202, Iss.1, 2000-07, pp. : 67-82

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Abstract

High-resolution measurements have been made on the infrared emission spectrum of H¹²C¹⁴N, H¹²C¹⁵N, and H¹³C¹⁴N at temperatures on the order of 1370 K. The measurements cover the region 400–850 cm^-1 with a resolution of 0.006 cm^-1. New room-temperature absorption measurements are also reported for H¹³C¹⁴N in the regions, 1200–1500 cm^-1 and 2500–3700 cm^-1. These measurements are combined with earlier measurements to obtain improved values for the rovibrational constants for these three isotopomers. The high temperatures allowed us to measure the bending vibrational levels up to the 0 11¹¹ 0 state, at more than 7900 cm^-1 above the ground vibrational level, for H¹²C¹⁵N and H¹³C¹⁴N, and the 0 10¹⁰ 0 state for H¹²C¹⁴N. The Coriolis interaction responsible for the laser transitions of H¹²C¹⁴N and H¹²C¹⁵N has also been observed, for the first time, for H¹³C¹⁴N. New r_e values are given using the B_e values found in this paper and in a recent paper on deuterated isotopomers.