Photoemission of n-ethylene glycols in the vacuum ultraviolet
Measurements of the absolute photoemission of liquids in the vacuum ultraviolet (uv) have been taken. Studies have focused on photoelectric yields of diethylene glycol, triethylene glycol, and tetraethylene glycol undoped and doped with lithium hydroxide solution (LiOH). The electron mean free paths calculated from experimental photoyields are submitted. Photon fluxes are determined by filling the ion chambers with argon gas. The absolute photoyield curves generally show monotonic behavior with the values in the neighborhood of 15% to 20%. These absolute photoyields are higher than expected. The data of our experiments indicate that the effects of doping with alkali salts on these n-ethylene glycols are small. The relation between the photoyields and the electron mean free paths is broken down in the photon energy region 16 eV to 30 eV when the threshold energy is 8 eV. It is suggested, therefore, that the photoelectric threshold energy be less than 8 eV and larger than 7 eV. Our electron mean free paths were compared with the empirical equation predicted from Seah and Dench for organics. The electron mean free paths calculated from our experimental data exceeded those predicted by Seah and Dench. Therefore, the empirical equation is not suitable for these n-ethylene glycols in the photon energy region 16 eV to 30 eV at low pressure. 29 figs.
- Research Organization:
- Tennessee Univ., Knoxville (USA)
- DOE Contract Number:
- FG05-86ER60415
- OSTI ID:
- 6010352
- Report Number(s):
- DOE/ER/60415-T1; ON: DE88000378
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400500 -- Photochemistry
656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALCOHOLS
ALKALI METAL COMPOUNDS
DATA
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY
EXPERIMENTAL DATA
GLYCOLS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
INFORMATION
LITHIUM COMPOUNDS
LITHIUM HYDROXIDES
MEAN FREE PATH
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PHOTOEMISSION
POLYETHYLENE GLYCOLS
POLYMERS
RADIATIONS
SECONDARY EMISSION
THEORETICAL DATA
THRESHOLD ENERGY
ULTRAVIOLET RADIATION