The spectra of trifluoronitrosomethane adsorbed on the sublimated films of sodium chloride have been characterized, both in the ultraviolet/visible and the infrared region. Selected band intensities were monitored as a function of pressure, allowing the calculation of isotherms for the adsorbate. By recording the shifts of vibrational modes of the adsorbate, the mode of adsorption is inferred. Subsequent isotherms will allow for the calculation of the heat of adsorption. A plausible mode of desorption has been proposed through analysis of the pressure fluctuations observed during spectra acquisition.