Study of hydrogen bond network of the nano-sized large hydrated clusters by infrared absorption spectroscopy

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We investigated the hydrogen-bonded structures of the pyrrole solvated clusters through the observation of the OH and NH stretching vibrations by IR cavity ringdown spectroscopy. It was concluded that not only sigma H-bond between pyrrole NH and solvent O atom but also pi H-bond between solvent OH and pyrrole pi electron is important to understand the solvated structures. In addition, we studied the NH stretching vibrations of large ammonia clusters, and concluded that the cluster forms crystalline structure with increasing size.