Isotope effects on the populations of metastable H/sub 3/ and D/sub 3/ molecules in neutralized ion beams

Journal Article · Sat Jun 01 04:00:00 EDT 1985 · J. Chem. Phys.; (United States)

OSTI ID:5748993

Jeon, S; Raksit, A B; Gellene, G I; Porter, R F

The relative abundances of metastable H(/sub 3/ and D(/sub 3/ molecules in collimated beams of neutralized ions are analyzed by the technique of collisional reionization (charge stripping). The fraction of metastable/dissociative species formed in the electron transfer process H/sup +//sub 3/(D/sup +//sub 3/)+K(g) ..-->.. H(/sub 3/(D(/sub 3/)+K/sup +/ diminishes if the precursor ions have excess internal energy. The abundance ratio of H(/sub 3//D(/sub 3/ for equivalent 6 keV beam fluxes increases sharply when the time span between neutralization and reionization is increased. The measurements show that a state of D(/sub 3/ with low rotational quantum numbers (N>0) is decaying on the time scale of the beam transit with a lifetime of about 0.2 ..mu..s. Results are interpreted in reference to the predissociation behavior of the 2p /sup 2/A/sup //sub 2/ electronic state of the radical. The disproportionate ratio of I*/sub 3//I*/sub 3/ >> 1 is a consequence of the relative abundances of precursor levels in H/sup +//sub 3/ and D/sup +//sub 3/ that can transform into metastables by electron transfer.

• Research Organization: Baker Laboratory of Chemistry, Cornell University, Ithaca, New York 14853
• OSTI ID: 5748993
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 82:11; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
BEAMS
CHARGE EXCHANGE
DEUTERIUM
DISSOCIATION
ELECTRON TRANSFER
ELEMENTS
ENERGY LEVELS
EXCITED STATES
HYDROGEN
HYDROGEN ISOTOPES
ION BEAMS
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
METASTABLE STATES
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PREDISSOCIATION
STABLE ISOTOPES