QUANTIFYING H ABUNDANCES ON THE MOON: THE ROLES OF COMPOSITION, OPTICAL CONSTANTS, AND BAND SHAPE
Systematic analyses of glass spectra from lunar-analog compositions are combined here with further analysis of the spectra from , with particular emphasis on the shape and components that make up the 3 μm band in glass reflectance and transmission spectra. In each spectrum, the 3 μm band has a distinctive shape that is a function of composition; each can be deconvolved into 1-3 Lorentzian or Gaussian component bands with consistent energies. Because both band shape and optical constants are directly related to composition, a relationship between band shape and optical constants is seen for any glass. Thus the shape of the 3 um band can directly inform the choice of appropriate optical constants to use to interpret the H abundances it represents. Automating this process would enable accurate measurements of H on various terrains on the lunar surface.
Complications to this simple algorithm include the variable effects of grain size on reflectance measurements of H in varying types of lunar materials, such as pyroclastic ashes, highland anorthosites, and mare basalts. Composition also affects solubility and diffusion of H in lunar materials, and may influence their resistance solar wind.
 King, P.L., and Larsen, J.F. (2013) Amer. Mineral., 98, 1162-1171.