In this review, noncovalent interactions of ions with neutral molecules are discussed. After
defining the scope of the article, which excludes anionic and most protonated systems …

1.1. Historical Background Hydrogen bonds 1, 2 are one of the principal intermolecular
forces. A special class are strong ionic hydrogen bonds (IHBs) that form between ions and …

The gas-phase structures of protonated and alkali metal cationized arginine (Arg) and
arginine methyl ester (ArgOMe) are investigated with infrared spectroscopy and ab initio …

Infrared multiple photon dissociation (IRMPD) spectroscopy allows for the derivation of the
vibrational fingerprint of molecular ions under tandem mass spectrometry (MS/MS) …

The structures of cationized arginine complexes [Arg+ M]+,(M= H, Li, Na, K, Rb, Cs, and Ag)
and protonated arginine methyl ester [ArgOMe+ H]+ have been investigated in the gas …

The gas-phase structures of alkali-metal cation complexes of serine (Ser) are examined
using infrared multiple photon dissociation (IRMPD) spectroscopy utilizing light generated …

The gas-phase acidities of the 20 protein amino acids (PAAs) have been determined using
an electrospray ionization–quadrupole ion trap instrument. Three different methods were …

The gas-phase structures of protonated and alkali-metal-cationized lysine (Lys) and ε-N-
methyllysine (Lys (Me)) are investigated using infrared multiple photon dissociation (IRMPD) …

The interaction of metal ions with aspartic (Asp) and glutamic (Glu) acid and the role of gas-
phase acidity on zwitterionic stability were investigated using infrared photodissociation …

Singly hydrated clusters of lithiated arginine, sodiated arginine, and lithiated arginine methyl
ester are investigated using infrared action spectroscopy and computational chemistry …