Photoemission yields of liquids in the vacuum ultraviolet

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5846460

Painter, L R; Hubbell, Jr, H H; Birkhoff, R D

A plethora of studies have been devoted to the phenomenon of photoemission from solid surfaces. These studies have been extremely useful in revealing details of electronic structure for many metals, semiconductors and insulators. However, similar studies exist for only a few liquids. Prior to our measurements no data was available for the liquid state in the energy region beyond 10 eV where collective oscillations can be excited. A number of insulating liquids of biological interest have been studied to 25 eV using optical techniques. All have been shown to have broad maxima in the energy loss function at about 21 eV. Although optical data indicates that plasma oscillations should occur, it does not provide direct observation of their existence, for photons cannot directly stimulate plasmons. Absolute photoemission yield measurements provide a more direct indication of the existence and magnitude of this important mode of energy deposition in liquid. An adaptation of the double-ion chamber method originated by Samson has been used to measure the incident beam intensity and the reflectance from a liquid surface in equilibrium with its vapor. In this photoionization method, the ionization in the vapor resulting from this absorption is used to monitor the beam strength before and after reflection. Reflectance, transmittance, and photoemission of liquids in the vacuum ultraviolet spectral region are analyzed to yield the optical and dielectric functions, the absolute photoemission, and the electron mean free paths in the liquid as functions of energy.

• Research Organization: Tennessee Univ., Knoxville (USA). Dept. of Physics and Astronomy; Science Applications, Inc., Oak Ridge, TN (USA); Science Applications, Inc., La Jolla, CA (USA)
• DOE Contract Number: AS05-76EV03861
• OSTI ID: 5846460
• Report Number(s): DOE/EV/03861-48; CONF-830710-9; ON: DE83017395
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ELECTROMAGNETIC RADIATION
EMISSION
EMISSION SPECTROSCOPY
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EXTREME ULTRAVIOLET RADIATION
FLUIDS
LIQUIDS
MEAN FREE PATH
ORGANIC SOLVENTS
PHOTOEMISSION
PLASMONS
QUASI PARTICLES
RADIATIONS
SECONDARY EMISSION
SOLVENTS
SPECTROSCOPY
ULTRAVIOLET RADIATION