title: Microhydration of Guanine base pairs.
abstract: We report spectroscopy of clusters of guanine base pairs with one and two water molecules. We recorded the vibronic spectra of the mass-selected GG(H2O) and GG(H2O)2 clusters using resonant two photon ionization (R2PI) and we used IR-UV double resonance spectroscopy to obtain ground state IR spectra of these clusters. We found that a single water molecule stabilizes one of two structures we had previously found for guanine dimers. Addition of a second water molecule causes no further structural change.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA.
authors.forename: Ali
authors.initials: A
authors.lastname: Abo-Riziq
authors.forename: Bridgit
authors.initials: B
authors.lastname: Crews
authors.forename: Louis
authors.initials: L
authors.lastname: Grace
authors.forename: Mattanjah S
authors.initials: MS
authors.lastname: de Vries
mesh_terms: D020029:Base Pairing; D006147:Guanine / Q000737:chemistry* / Q000378:metabolism; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D006147:Guanine