Threshold electron excitation of Auger-electron and x-ray emissions in La

Technical Report · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5646451

Chamberlain, M B; Burr, A F; Liefeld, R J

The intensities of the M/sub 5/O/sub 3/ and M/sub 5/N/sub 3/ characteristic X-ray lines and the M/sub 5/N/sub 4/,/sub 5/N/sub 4/,/sub 5/ Auger-electron line from La were measured as functions of the electron excitation energy near the M/sub 5/ ionization energy. The excitation curve of each of these emissions contains a line-like structure a few eV above the threshold. The full width at half maximum (3.0 +- 0.2 eV) and relative height (4x) of this structure are the same in these three excitation curves; however, they are different than the respective values (2.3 +- 0.2 eV and 200x) we previously measured for a resonant bremsstrahlung emission observed when the electron excitation energy was near the M/sub 5/ ionization energy. These results support our earlier proposal that two distinct states are excited for near threshold, electron excitation of the La M/sub 5/ level: the 3d/sup 9/ 4f/sup 0/ state which decays via the M/sub 5/ series characteristic X-ray and Auger-electron emissions, and the 3d/sup 9/4f/sup 2/ intermediate bound state which appears to decay by only a single channel - the emission of a resonant X ray with a photon energy of 832 +- 1 eV. These results may be evidence of a closed channel resonance in the electron scattering cross section in solid La, similar to resonances found in Ne gas.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA); New Mexico State Univ., Las Cruces (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5646451
• Report Number(s): SAND-83-1918C; CONF-831171-6; ON: DE84000946
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AUGER EFFECT
AUGER ELECTRON SPECTROSCOPY
COLLISIONS
DATA
DE-EXCITATION
ELECTRON COLLISIONS
ELECTRON SPECTRA
ELECTRON SPECTROSCOPY
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPERIMENTAL DATA
FERMIONS
INFORMATION
LANTHANUM
LEPTONS
METALS
NUMERICAL DATA
RARE EARTHS
SPECTRA
SPECTROSCOPY
X-RAY SPECTRA