Spectra from multiphoton electron detachment of H sup minus

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Journal of the Optical Society of America, Part B: Optical Physics; (USA)

DOI:https://doi.org/10.1364/JOSAB.8.000017· OSTI ID:5756224

Smith, W W ^[1]; Tang, C Y ^[2]; Quick, C R ^[3]; Bryant, H C; Harris, P G; Mohagheghi, A H ^[2]; Donahue, J B; Reeder, R A ^[4]; Sharifian, H ^[5]; Stewart, J E ^[6]; Toutounchi, H ^[7]; Cohen, S ^[3]; Altman, T C ^[8]; Risolve, D C ^[9]

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1. University of Connecticut, Storrs, CT (USA)
2. University of New Mexico, Albuquerque, NM (USA)
3. Los Alamos National Laboratory, Los Alamos, NM (USA)
4. Los Alamos National Laboratory, Los Alamos NM (USA)
5. California State University, Long Beach, CA (USA)
6. Western Washington University, Bellingham, WA (USA)
7. University of Mashhad, Mashhad (Iran)
8. Oswego High School, Oswego, NY (USA)
9. St. Mary's College, Winona, MN (USA)

New data are reported on the multiphoton detachment process in a fast beam of H{sup {minus}} ions. The angle-tuned relativistic Doppler shift is used to vary the photon energy of a focused ({similar to}10 GWm/c{sup 2}) 10.6-{mu}m CO{sub 2} laser beam from {similar to}0.05 to {similar to}0.4 eV in the rest frame (CM frame) of the fast ions. The ions are produced at 800 MeV ({beta}=v/c=0.84) by the Los Alamos Meson Physics Facility linear accelerator at Los Alamos and experience {similar to}1-psec pulses in the CM frame as they cross the laser beam focus. Peaks in the detachment signal corresponding to each order for two- to six-photon processes are observed. At modest laser intensity in the gigawatt-per-square-centimeter range, observed shifts of the apparent two-photon threshold are found to be not more than 30--50% of the expected maximum shift, based on the value of the ponderomotive potential. Experimental uncertainties are due mainly to imprecise knowledge of the maximum laser intensity. The data analysis and experiments are continuing.

• OSTI ID: 5756224
• Journal Information: Journal of the Optical Society of America, Part B: Optical Physics; (USA), Journal Name: Journal of the Optical Society of America, Part B: Optical Physics; (USA) Vol. 8:1; ISSN JOBPD; ISSN 0740-3224
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANIONS
ATOMIC IONS
BEAMS
CHARGED PARTICLES
DATA
DATA ANALYSIS
DOPPLER EFFECT
ELECTROMAGNETIC RADIATION
ELECTRON DETACHMENT
ENERGY RANGE
EXPERIMENTAL DATA
FOCUSING
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
INFORMATION
ION BEAMS
IONS
LASER RADIATION
MEV RANGE
MEV RANGE 100-1000
MULTI-PHOTON PROCESSES
NUMERICAL DATA
RADIATIONS
RELATIVISTIC RANGE
SPECTRAL SHIFT