The adsorption of tetra-butyl nitrite, (CH3) 3CONO, on Ag(111) at 85 K is studied by thermal description spectroscopy (TDS) and X-ray photoelectron spectroscopy (XPS). Tert-butyl nitrite was found to adsorb reversibly, and with increasing exposure, first the saturation of the monolayer occurred, and subsequently, multilayers were formed. The sticking coefficient was found to be coverage-independent. The desorption energies are around 0.42 eV in both the monolayer and multilayer regime.