Atmospheric aerosols exert a significant but highly uncertain effect on the global climate,
and roughly half of these particles originate as small clusters formed by collisions between …

The ease with which the pH is routinely determined for aqueous solutions masks the fact that
the cationic product of Arrhenius acid dissolution, the hydrated proton, or H+ (aq), is a …

We review the role that gas-phase, size-selected protonated water clusters, H+ (H2O) n,
have played in unraveling the microscopic mechanics responsible for the spectroscopic …

Theoretical models of proton hydration with tens of water molecules indicate that the excess
proton is embedded on the surface of clathrate-like cage structures with one or two water …

We report the vibrational spectra of the hydronium and methyl-ammonium ions captured in
the C3 v binding pocket of the 18-crown-6 ether ionophore. Although the NH stretching …

The extremely broad infrared spectrum of water in the OH stretching region is a
manifestation of how profoundly a water molecule is distorted when embedded in its …

Two-dimensional infrared (2D IR) spectroscopy of mass-selected, cryogenically cooled
molecular ions is presented. Nonlinear response pathways, encoded in the time-domain …

New particle formation (NPF) is the process by which trace atmospheric acids and bases
cluster and grow into particles that ultimately impact climate. Sulfuric acid concentration …

Phenol-benzimidazole and phenol-pyridine dyad complexes have served as popular model
systems for the study of proton-coupled electron transfer (PCET) kinetics in solution-phase …

Iodine-containing clusters are expected to be central to new particle formation (NPF) events
in polar and midlatitude coastal regions. Iodine oxoacids and iodine oxides are observed in …