Multiphoton dissociative ionization of molecular deuterium

Journal Article · Thu Dec 15 04:00:00 EST 1988 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.38.6180· OSTI ID:6648816

Luk, T S; Rhodes, C K

The kinetic energy spectra of deuterium ions produced from D/sub 2/ arising from collision-free subpicosecond irradiation at 248 nm with intensities spanning the 10/sup 13/--10/sup 16/-W/cm/sup 2/ range have been measured by time-of-flight analysis. The behaviors of the kinetic energy distributions of the fragments and the relative abundances of atomic (D/sup +/) and molecular (D/sub 2//sup +/) ions reveal the presence of two mechanisms of multiphoton dissociative ionization. Calibration of the energy scale for D/sup +/ is facilitated by comparison with He/sup 2+/. For intensities in the 10/sup 13/--10/sup 15/-W/cm/sup 2/ region, intermediate three-photon resonances and the optical Stark shift play important roles. At an intensity /similar to/0/sup 16/ W/cm/sup 2/, a direct transition from the molecular ground state to the dissociative ionic level appears as a significant channel. No evidence of direct double ionization was observed.

• Research Organization: Laboratory for Atomic, Molecular, and Radiation Physics, Department of Physics, University of Illinois at Chicago, P.O. Box 4348, Chicago, Illinois 60680
• OSTI ID: 6648816
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 38:12; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
CHARGED PARTICLES
DEUTERIUM
DEUTERONS
DYNAMICS
ENERGY SPECTRA
HYDROGEN ISOTOPES
IONIZATION
ISOTOPES
LIGHT NUCLEI
MECHANICS
MOLECULES
MULTI-PHOTON PROCESSES
NUCLEI
ODD-ODD NUCLEI
PHOTOIONIZATION
SPECTRA
STABLE ISOTOPES
TIME-OF-FLIGHT METHOD