Metastable deexcitation spectroscopy: A new probe of surface of magnetism

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5044950

Onellion, M F

A new method, described herein, has been developed for probing magnetic and other spin-dependent surface properties. The technique utilizes a He 2 {sup 3}S{sub 1} beam in which a plurality of atoms is in one m{sub j} level. This electron spin polarized beam has been used to probe the surface magnetic properties of a clean and adsorbate-covered Ni (110) crystal. The electrons ejected from the sample when the metastables deexcite depend upon metastable polarization and sample magnetization. By examining the ejected electrons, the sample magnetization has been measured as a function of electron energy, crystal temperature, and adsorbate (CO) coverage. The results demonstrate that He 2 {sup 3}S{sub 1} metastables constitute a method for probing surface magnetism with unparalleled surface specificity. A new attenuation has been solved under such general conditions. A new theorem about the deformation potential obtained from the electronphonon matrix element is also proved. Part B of the dissertation is concerned with the temperature dependence of the elastic constants of heavily doped p-type Silicon (Si). The band structure of Si under the influence of a strain is determined by using {bar k} {center dot} {bar p} pertubation technique. Effects of spin-orbit coupling are not neglected. The temperature dependence of the elastic constants of Si is determined and the appropriate temperature coefficients are numerically calculated.

• Research Organization: Rice Univ., Houston, TX (USA)
• OSTI ID: 5044950
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360000 -- Materials
360104* -- Metals & Alloys-- Physical Properties
DATA
ELEMENTS
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
INFORMATION
MAGNETIC PROBES
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
METASTABLE STATES
NICKEL
NUMERICAL DATA
PROBES
SEMIMETALS
SILICON
SURFACE PROPERTIES
TRANSITION ELEMENTS