Abstract
The ammonia ν 1 + 2 ν 4 perpendicular stretch-bend combination band has been investigated in spectra of 14NH 3 and 15NH 3 recorded in the 6400–6800 cm −1 region with an external cavity tunable diode laser (ECTDL) spectrometer. For 14NH 3, new assignments were determined initially by extrapolating from published low- J jet-cooled beam results up to transitions of higher J and K. Corresponding ν 1 + 2 ν 4 transitions for the 15NH 3 species were then found by identifying similar patterns of lines with a characteristic downshift of approximately 9.7 cm −1. Assignments were confirmed employing ground-state combination differences. Term values, a– s inversion splittings, l-doubling energies and parameter estimates from simple single-state fits are reported for the two ammonia species.
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