Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

Measurement of Vibrational Feshbach Resonances Mediated by Nondipole Positron-Molecule Interactions

James R. Danielson, Michael R. Natisin, Clifford M. Surko, A. R. Swann, G. F. Gribakin

Published May 30, 2018• 0 citations
OpenAlex

Related papers

Energy-resolved positron-molecule annihilation: Vibrational Feshbach resonances and bound states

L. D. Barnes

•Jul 1, 2005•1 citation

Positron-molecule annihilation, Feshbach resonances and bound states

Jason A. Young, Clifford M. Surko

Bulletin of the American Physical Society•Oct 19, 2005•0 citations

Bound States and Feshbach Resonances in Positron-Molecule Annihilation

Jason A. Young

Bulletin of the American Physical Society•May 28, 2008•0 citations

Vibrational Feshbach Resonances Mediated by Nondipole Positron-Molecule Interactions

Michael R. Natisin, James R. Danielson, G. F. Gribakin +2 more

Measurements of energy-resolved positron-molecule annihilation show the existence of positron binding and vibrational Feshbach resonances. The existing theory describes this phenomenon successfully for the case of infrared-active vibrational modes that allow dipole coupling between the incident positron and the vibrational motion. Presented here are measurements of positron-molecule annihilation made using a recently developed cryogenic positron beam capable of significantly improved energy resolution. The results provide evidence of resonances associated with infrared-inactive vibrational modes, indicating that positron-molecule bound states may be populated by nondipole interactions. The anticipated ingredients for a theoretical description of such interactions are discussed.

arXiv:1708.04938•Physical Review Letters•Sep 15, 2017•26 citations

Dipole Enhancement of Positron Binding to Molecules

James R. Danielson, J. J. Gosselin, Clifford M. Surko

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.

Physical Review Letters•Jun 9, 2010•89 citations

Role of Binding Energy in Feshbach-Resonant Positron-Molecule Annihilation

Jason A. Young, Clifford M. Surko

Measurements of positron-on-molecule annihilation have established that positrons bind to a variety of molecules via vibrational Feshbach resonances. Data for deeply bound states in benzene and 1-chlorohexane and for positronically excited (i.e., second) bound states in alkanes are used to establish the dependence of annihilation rates on the binding energy and incident positron energy. With this dependence removed, annihilation rates for a broad class of molecules lie on a universal curve as a function of the number of molecular vibrational degrees of freedom. The implications of these results for theoretical models are discussed.

Physical Review Letters•Sep 28, 2007•24 citations
Measurements of energy-resolved positron-molecule annihilation show the existence of positron binding and vibrational Feshbach resonances. The existing theory describes this phenomenon successfully for the case of infrared-active vibrational modes that allow dipole coupling between the incident positron and the vibrational motion. Presented here are measurements of positron-molecule annihilation made using a recently developed cryogenic positron beam capable of significantly improved energy resolution. The results provide evidence of resonances associated with infrared-inactive vibrational modes, indicating that positron-molecule bound states may be populated by nondipole interactions. The anticipated ingredients for a theoretical description of such interactions are discussed.
Measurements of positron-on-molecule annihilation have established that positrons bind to a variety of molecules via vibrational Feshbach resonances. Data for deeply bound states in benzene and 1-chlorohexane and for positronically excited (i.e., second) bound states in alkanes are used to establish the dependence of annihilation rates on the binding energy and incident positron energy. With this dependence removed, annihilation rates for a broad class of molecules lie on a universal curve as a function of the number of molecular vibrational degrees of freedom. The implications of these results for theoretical models are discussed.