Measurement of absolute rates for multiphoton ionization of atomic hydrogen at 248 nm
- Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (US)
We present measurements of absolute rates for multiphoton ionization of the ground state of atomic hydrogen by a linearly polarized, subpicosecond KrF laser at a wavelength of 248 nm. The irradiance was varied from 3{times}10{sup 12} to 2{times}10{sup 14} W/cm{sup 2}, and three above-threshold-ionization peaks were observed. The measured rate for total electron production was less than that predicted by Floquet theory (S.-I. Chu and J. Cooper, Phys. Rev. A 32, 2769 (1985)) and perturbation calculations (S. V. Khristenko and S. I. Vetchinkin, Opt. Specktrosk. 40, 417 (1976)), but significantly higher than calculated by the Reiss (Phys. Rev. A 22, 1786 (1980)) and Keldysh (Sov. Phys.---JETP 20, 1307 (1965)) methods using Volkov final states.
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5444081
- Journal Information:
- Physical Review A. General Physics; (United States), Vol. 44:3; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HYDROGEN
IONIZATION
ATOMIC BEAMS
ELECTRON SPECTROMETERS
GROUND STATES
LASER RADIATION
MULTI-PHOTON PROCESSES
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
POLARIZED BEAMS
ATOM COLLISIONS
BEAMS
COLLISIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
MEASURING INSTRUMENTS
NONMETALS
PHOTON COLLISIONS
RADIATIONS
SPECTROMETERS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena