title: Dipole enhancement of positron binding to molecules.
abstract: Measurements of positron-molecule binding energies are made for molecules with large permanent dipole moments (>2.7  D), by studying vibrational-Feshbach-mediated annihilation resonances as a function of incident positron energy. The binding energies are relatively large (e.g., ≥90  meV) as compared to those for similar sized molecules studied previously and analogous weakly bound electron-molecule (negative ion) states. Comparisons with existing theoretical predictions are discussed.
authors.affiliation: Department of Physics, University of California at San Diego, La Jolla, California 92093, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Danielson
authors.forename: J J
authors.initials: JJ
authors.lastname: Gosselin
authors.forename: C M
authors.initials: CM
authors.lastname: Surko
mesh_terms: D000079:Acetaldehyde / Q000737:chemistry; D000096:Acetone / Q000737:chemistry; D000097:Acetonitriles / Q000737:chemistry; D002246:Carbon Disulfide / Q000737:chemistry; D004583:Electrons; D007287:Inorganic Chemicals / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry*
chemical_list: D000097:Acetonitriles; D007287:Inorganic Chemicals; D009930:Organic Chemicals; D000096:Acetone; D000079:Acetaldehyde; D002246:Carbon Disulfide; C032159:acetonitrile