Resonance and threshold effects in photoemission up to 3500 eV

Conference · Sun Aug 01 04:00:00 EDT 1982

OSTI ID:6699202

Shirley, D A; Kobrin, P H; Lindle, D W; Truesdale, C M; Southworth, S H; Becker, U; Kerkhoff, H G

Beam lines at the Stanford Synchrotron Radiation Laboratory (SSRL) now provide photon beams throughout the entire energy range 5 to 5000 eV, with a pulse structure very well-suited to time-of-flight (TOF) photoelectron spectroscopy. We have used this facility, together with a TOF spectrometer, to measure photoemission cross sections sigma(epsilon) and asymmetry parameters ..beta..(epsilon) for several interesting systems. A summary of early results is given. Metal vapors (Ba, Cd, Mn, Hg) were studied using a high-temperature oven. Resonant photoemission was observed in several cases. Both sigma(epsilon) and ..beta..(epsilon) showed resonant behavior at 21.1 eV for several lines in Cd. The 4d, 5s, and 5p sigma(epsilon) line profiles differed dramatically, illustrating the detailed information about continuum states that is available from photoemission. Correlation satellites in photoemission from rare gases have been observed over a very wide energy range, including those seen in the K-shells of He, Ne and Ar and in the L-shell of Ne. The structure and preliminary intensity variations of these satellites will be discussed. Molecular shape resonances in C(1s), N(1s), and O(1s) photoemission were observed for the first time, in the molecules CO, CO/sub 2/, OCS, CF/sub 4/, N/sub 2/ and NO. Both the ..pi.. and sigma resonances were observed in KVV Auger emission, and the sigma resonances were studied by photoemission. The asymmetry parameters were measured in all cases. The results are in fair agreement with theory, but show systematic deviations and trends. 31 references.

• Research Organization: Lawrence Berkeley Lab., CA (USA); California Univ., Berkeley (USA). Dept. of Chemistry; Technische Univ. Berlin (Germany, F.R.). Fachbereich Physik
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6699202
• Report Number(s): LBL-14857; CONF-820855-4; ON: DE83000515
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALINE EARTH METALS
ARGON
BARIUM
BREMSSTRAHLUNG
CADMIUM
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
EMISSION
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
FLUIDS
GASES
HELIUM
KEV RANGE
KEV RANGE 01-10
MANGANESE
MERCURY
METALS
NEON
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PHOTOEMISSION
RADIATIONS
RARE GASES
RESONANCE
SECONDARY EMISSION
SPECTROSCOPY
SYNCHROTRON RADIATION
TRANSITION ELEMENTS