The infrared spectrum of NH3-dn trapped in solid neon

ND-stretching vibrational energy relaxation of NH2D in liquid-to-supercritical ammonia studied by femtosecond midinfrared spectroscopy

“…This frequency difference drops to 50-60 cm −1 in going from the gas phase into a cryogenic inert gas matrix. 34 The antisymmetric component, 3b , of NHD 2 , on the other hand, is blueshifted in the gas phase 32,33 by just 54 cm −1 relative to 1 of the solute. This value remains almost unchanged when the solute is embedded in a cryogenic matrix.…”

“…All spectra were normalized to the concentration of the NH 2 D solute, i.e., the absorbance was scaled to represent a relative molar extinction coefficient of the solute. The vibrational spectra of the various isotopomers of ammonia monomers were recently explored in the gas phase by Snels et al 32,33 and in cryogenic solid-state matrices 34,[38][39][40] using high-resolution Fouriertransform IR spectroscopy. For our solute, NH 2 D, the NDstretching mode, 1 , was found in the gas phase 32,33 at 2506 cm −1 , as represented in Fig.…”

“…To test the significance of hydrogen bonding for vibrational relaxation dynamics in this apparently weakly associated fluid and to provide a direct comparison to our previous studies on fluid water, we decided to carry out conventional mid-IR pump-probe spectroscopy on the stretching vibrations in liquid-to-supercritical ammonia. Unfortunately, the NH-stretching region of NH 3 is heavily perturbed by strong Fermi coupling [30][31][32][33][34] between the stretching fundamental, 1 , and the first overtone of the antisymmetrical bending mode, 2 4 , as evidenced by the appearance of two NH-stretching bands in the isotropic Raman spectrum of NH 3 rather than one. 17 To avoid this additional complexity, partial deuteration can be used to lift those Fermi resonances 33,34 and to provide highly diluted solute vibrations that are spectroscopically distinct from those of the solvent.…”

“…Unfortunately, the NH-stretching region of NH 3 is heavily perturbed by strong Fermi coupling [30][31][32][33][34] between the stretching fundamental, 1 , and the first overtone of the antisymmetrical bending mode, 2 4 , as evidenced by the appearance of two NH-stretching bands in the isotropic Raman spectrum of NH 3 rather than one. 17 To avoid this additional complexity, partial deuteration can be used to lift those Fermi resonances 33,34 and to provide highly diluted solute vibrations that are spectroscopically distinct from those of the solvent. Here, we report on the relaxation dynamics of the ND-stretching vibration of the monodeuterated ammonia species NH 2 D ͑the solute͒ in liquid-to-supercritical ammonia, NH 3 ͑the solvent͒.…”

Polymorphic phase transformation of Degussa P25 TiO2 by the chelation of diaminopyridine on TiO62− octahedron: Correlation of anatase to rutile phase ratio on the photocatalytic activity

“…The peaks at ∼3420 and ∼1630 cm −1 are assigned to the stretching and bending vibrations of the hydroxyl groups (O H). The peaks at ∼2920 and ∼2840 cm −1 were attributed to the Ti OH bond [33][34][35][36]. The broad absorption band in the region 500-800 cm −1 is assigned to the stretching vibration of Ti O and Ti O Ti bonds [33].…”