DESORPTION FROM SURFACES BY SLOW-ELECTRON IMPACT

Journal Article · Sat Feb 15 04:00:00 EST 1964 · Journal of Chemical Physics (U.S.)

DOI:https://doi.org/10.1063/1.1725269· OSTI ID:4118131

Menzel, D; Gomer, R

An adsorbate-covered W field emitter was bombarded from one side with low-energy electrons from a simple gun and changes were looked for visually and by work-function measurements. Beam intensities were determined by replacing the field emitter with a microprobe and were approximates 10/sup -4/ amp/cm/sup 2/ above 10 ev. With hydrogen on W no desorption could be detected at any coverage between 4 and 300 deg K, with energies from 10 to 200 ev. With oxygen, desorption was detected only from a full layer, deposited by low-temperature spreading and heated to 80 deg K to evaporate physisorbed oxygen. Desorption was limited to energies)25 ev. The salient feature of the results is the remarkable small reaction cross section, which is approximates 10/sup -4/ that of ionization or excitation in the gas phase. (P.C.H.)

• Research Organization: Univ. of Chicago
• Sponsoring Organization: USDOE
• NSA Number: NSA-18-012196
• OSTI ID: 4118131
• Journal Information: Journal of Chemical Physics (U.S.), Journal Name: Journal of Chemical Physics (U.S.) Vol. Vol: 40; ISSN JCPSA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ADSORPTION
CHEMISTRY
CONFIGURATION
CURRENTS
ELECTRON BEAMS
ENERGY LEVELS
ENERGY RANGE
EVAPORATION
EXCITATION
FILMS
GASES
HYDROGEN
IONIZATION
LOW TEMPERATURE
MATHEMATICS
MEASURED VALUES
NUMERICALS
OXYGEN
PARTICLE SOURCES
RADIATION DOSES
RADIATION EFFECTS
REACTION KINETICS
TEMPERATURE
TUNGSTEN
VARIATIONS