Multiphoton dissociative ionization of molecular deuterium
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), Vol. 38:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DEUTERIUM
PHOTOIONIZATION
DEUTERONS
DYNAMICS
ENERGY SPECTRA
MOLECULES
MULTI-PHOTON PROCESSES
TIME-OF-FLIGHT METHOD
CHARGED PARTICLES
HYDROGEN ISOTOPES
IONIZATION
ISOTOPES
LIGHT NUCLEI
MECHANICS
NUCLEI
ODD-ODD NUCLEI
SPECTRA
STABLE ISOTOPES
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory