Articles you may be interested inCommunication: He-tagged vibrational spectra of the SarGlyH+ and H+(H2O)2,3 ions: Quantifying tag effects in cryogenic ion vibrational predissociation (CIVP) spectroscopy Exploring the correlation between network structure and electron binding energy in the ( H 2 O ) 7 − cluster through isomer-photoselected vibrational predissociation spectroscopy and ab initio calculations: Addressing complexity beyond types I-IIIClustering of water on protonated molecular ions has been investigated by vibrational predissociation spectroscopy. Systematic measurements at different cluster sizes reveal a close resemblance of the OH stretch spectra between NH 4 ϩ ͑H 2 O͒ n , CH 3 NH 3 ϩ ͑H 2 O͒ n , and H 3 O ϩ ͑H 2 O͒ n . Particularly at nу6, a sharp feature, identical to that found on ice and water surfaces, emerges at 3690 cm Ϫ1 for free-OH stretching. The feature is distinguished from the other free-OH absorption, commonly observed for small-and medium-sized (H 2 O) n clusters at 3715 cm Ϫ1 . The results, in conjunction with ab initio calculations, provide compelling evidence for 2-and 3-coordinated H 2 O in the protonated ion-water clusters.

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