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4 BAND TRANSITIONS OF NH4+ AND ND4+.
CHANGHONG XIA, MARIA M. SANZ AND STEPHEN C. FOSTER, Department of Chemistry, Mississippi State University Mississippi State, MS 39762-9573.
The tetrahedral ammonium ion has two triply-degenerate infrared-active fundamentals. In 1983, Crofton and Oka; and Schafer,Begemann,Gudeman and Saykally observed the 3 fundamental of NH4+ in glow discharges. Several subsequent studies have been reported, but only one concerns the other IR-active fundamental. In this work, more than thirty new lines in the 4 band of NH4+ are reported, together with the first detection of the same band of ND4+.
These ammonium ions were observed in a water-cooled hollow cathode discharge with a diode laser spectrometer. A program was written to fit the spectra to fourth order based upon the spherical top Hamiltonian of Robiette et al . and using an uncoupled basis set.