science-softCon uv/vis+ photochemistry database; www.photochemistry.org; (C) science-softCon 2019 Substance: ammonia Other Names: Formula: NH3 CAS-No.: 7664-41-7 Study: uv absorption spectrum Authors: A.B.F. Duncan Title: The Ultraviolet Absorption Spectrum of Ammonia Journal/Source: Phys. Rev., 47, 822-827, (1935); DOI:10.1103/PhysRev.47.822 Data: photograph Energy/Wavelength range: 85 - 230 nm Resolution: Temperature: Temperature dependence: Pressure/Concentration: Phase: gas pH: Comments: The discrete absorption spectrum of ammonia has been photographed from 2300 to 850A. The bands down to 1665A are all diffuse because of predissociation. Below 1665 all the bands are very sharp and show rotational fine structure which is partly resolved. True continuous absorption (in distinction to that produced by pressure broadening) does not begin until about 1200A. At 1150A and below the continuous absorption is so strong that no more bands could be measured accurately. Author to whom correspondence should be addressed: (e-mail address):