@article {C3CP50985K,
	title = {Structures of hydrogen bond networks formed by a few tens of methanol molecules in the gas phase: size-selective infrared spectroscopy of neutral and protonated methanol clusters},
	journal = {Phys. Chem. Chem. Phys.},
	volume = {15},
	year = {2013},
	note = {n/a},
	pages = {9523-9530},
	publisher = {The Royal Society of Chemistry},
	abstract = {<p>In this work{,} we report infrared spectra of large neutral and protonated methanol clusters{,} (MeOH)n and H+(MeOH)n{,} in the CH and OH stretching vibrational region in the size range of n = 10-50. The infrared-ultraviolet double resonance scheme combined with mass spectrometry was employed to achieve moderate size selection of the neutral clusters with the addition of a phenol molecule as a chromophore. Infrared dissociation spectroscopy was performed on the protonated methanol clusters by using a tandem quadrupole mass spectrometer to enable the precise size selection of the clusters. While the neutral clusters showed essentially the same spectra in all the observed size range{,} the protonated clusters showed remarkable narrowing of the H-bonded OH stretch band with increasing n. In n [greater-than-or-equal] [similar]30{,} the spectra of the neutral and protonated clusters become almost identical. These spectral features demonstrate that hydrogen bond networks of methanol prefer simple cyclic structures (or {"}bicyclic{"} structures in protonated methanol) and branching of the hydrogen bond networks (side-chain formation) is almost negligible. Implications of the spectra of the clusters are also discussed by comparison with spectra of bulk phases.</p>
},
	doi = {10.1039/C3CP50985K},
	url = {http://dx.doi.org/10.1039/C3CP50985K},
	author = {Kobayashi, Tomohiro and Shishido, Ryunosuke and Mizuse, Kenta and Fujii, Asuka and Jer-Lai Kuo}
}
