Self-association of NH3 and ND3 is observed in the infrared spectra of cryosolutions with liquid xenon.
Least-squares fitting of polynomials to the data allows us to resolve spectral regions with overlapping absorbance bands.
Least-squares fitting of polynomials yields accurate information on monomer and oligomer species present in the solutions.
The least-squares fitting method shows an added value towards other methods often used.