Fig. 4: PI-ReTOF mass and infrared (IR) spectra of D3-ammonia (ND3) treated montmorillonite samples.
From: Origin of ammoniated phyllosilicates on dwarf planet Ceres and asteroids
TPD (temperature programmed desorption) profiles measured at mass-to-charge ratio (m/z) of (a) 20 and (b) 17 in the mass spectrum of ND3 coated natural montmorillonite at a photoionization energy of 10.49 eV. D3-ammonia (ND3) and ammonia (NH3) are assigned to the ion signals at m/z = 20 and m/z = 17 respectively. Deconvoluted infrared spectra of D3-ammonia treated (c) commercial and (d) natural montmorillonite. Vibrational modes of chemical species are labeled using symbols ‘ν’ and ‘δ’.
