Abstract
Steady-state and ultrafast vibrational spectroscopy can help to elucidate the interactions between small anions and their environment because the anions’ infrared absorption frequencies and vibrational energy relaxation (VER) times depend strongly on those interactions. Their strong infrared absorptions also make many of these anions promising candidates for strong coupling to optical fields. Here, we report the vibrational energy relaxation of dicyanamide (DCA) in H2O and D2O and find that the so-called solvent isotope effect on VER is not as pronounced as for other anions. In addition, we report the infrared spectroscopy and VER lifetimes of DCA, N3−, and NCS− embedded in a polyelectrolyte polymer. We find that the polymer matrix accelerates VER in a similar fashion to H2O, but the detailed mechanism of this acceleration remains unclear.
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