Microwave spectra of the D[sub 2][sup +] and HD[sup +] ions near their dissociation limits

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.464928· OSTI ID:5406789

Carrington, A; Leach, C A; Marr, A J; Moss, R E; Pyne, C H; Steimle, T C ^[1]

---

1. Department of Chemistry, University of Southampton, Hampshire SO9 5NH (United Kingdom)

We have observed and measured seven microwave transitions in D[sub 2][sup +], which are vibration--rotation components of the 2[ital p][sigma][sub [ital u]]--1[ital s][sigma][sub [ital g]] electronic band system. We also report two microwave rotational components involving the 1[ital s][sigma] [ital v]=21 level of HD[sup +], which lies close to the first dissociation limit. Our experiments use ion beam techniques in which state selection is achieved by electric field dissociation. The techniques and theory of electric field dissociation are discussed, and fragment ion kinetic energy spectra described. [ital Ab] [ital initio] calculations of the transition frequencies for both D[sub 2][sup +] and HD[sup +] are in excellent agreement with experiment, and the hyperfine structure of the rotational transitions in HD[sup +] confirms previous demonstrations of the increasing asymmetry in the electron distribution as the dissociation limit is approached. The electronic transition in D[sub 2][sup +] which involves the highest bound level of the ground state shows an unexpected hyperfine splitting, which is interpreted in terms of [ital g]/[ital u] symmetry breaking by the deuteron Fermi contact interaction.

• OSTI ID: 5406789
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 98:7; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
664400 -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
BEAMS
CATIONS
CHARGED PARTICLES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEUTERIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
DISLOCATIONS
DISSOCIATION ENERGY
ELECTRIC FIELDS
ENERGY
ENERGY LEVELS
EXCITED STATES
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
HYDROGEN ISOTOPES
ION BEAMS
IONS
ISOTOPES
KINETIC ENERGY
LIGHT NUCLEI
LINE DEFECTS
MICROWAVE SPECTRA
NUCLEI
ODD-ODD NUCLEI
ROTATIONAL STATES
SPECTRA
STABLE ISOTOPES
SYMMETRY BREAKING
VIBRATIONAL STATES