Dissociation Energies of Molecular Hydrogen and the Hydrogen Molecular Ion

Y. P. Zhang, C. H. Cheng, J. T. Kim, J. Stanojevic, and E. E. Eyler

Phys. Rev. Lett. 92, 203003 – Published 20 May 2004

Abstract

We have obtained improved values for the dissociation energies of molecular hydrogen and its ion by using a high-resolution pulse-amplified laser to probe the second dissociation limit. The onset of the vibrational continuum is observed by state-selective detection of the atomic products of dissociation, and several auxiliary measurements link the results to the ground state. The dissociation energies are accurate to $0.010 - 0.026 {cm}^{- 1}$ , improving previous measurements by a factor of 3–7. Agreement with ab initio calculations is good for $H_{2}$ , $D_{2}$ , and their ions, but not for HD and ${HD}^{+}$ .

Received 31 July 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.203003

Authors & Affiliations

Y. P. Zhang, C. H. Cheng^*, J. T. Kim^†, J. Stanojevic, and E. E. Eyler

Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA

^*Present address: Panasonic Boston Laboratory, 68 Rogers Street, Cambridge, MA 02142, USA.
^†Present address: Department of Photonic Engineering, Chosun University, Gwangju, 501-759 Korea.

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Vol. 92, Iss. 20 — 21 May 2004

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