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On the temperature dependence of the work function
A652 342
Surface Science 178 (1986) 342-348 North-Holland, Amsterdam
SPIN-POLARIZED ANGLE-RESOLVED PHOTOEMISSION FROM THE (110) SURFACE OF PLATINUM
J. GARBE, D. VENUS, S. SUGA *, C. SCHNEIDER
and J. KIRSCHNER
Institut firr Grenrflijchenforschung und Vakuumphysik, Kernforschungsanlage Jiilich. Postfach 1913, D-51 70 Jiilich, Fed. Rep. of Germon_v Received
17 March
1986; accepted
for publication
2
June 19%
Spin-polarized, angle-resolved photoemission experiments in normal emission from the reconstructed (110) surface of platinum have been performed with circularly polarized synchrotron radiation from the Berlin storage ring BESSY. Along the (110) direction direct transitions with a non-zero spin polarization are only expected if there is considerable hybridization between certain single-group representations in either the initial- or the final-state bands. Our results show spin-polarization values of up to 30% and most of the peaks in the spectra can be understood in terms of direct bulk transitions. The spin-polarization data provide information about the hybridization of the initial states along the (110) direction.
349
Surface Science 178 (1986) 349-358 North-Holland, Amsterdam
ON THE TEMPERATURE
DEPENDENCE
OF THE WORK FUNCTION
A. KIEJNA Institute of Experimental Physics, University of Wrocfaw, ul. Cybulskiego 36, 50-205 Wroclaw, Poland Received
10 March
86; accepted
for publication
16 June 86
The influence of thermal expansion and atomic vibrations on the temperature dependence of the metal work function is analyzed. For the low-index planes of the group of metals considered (Li, Na, Al, Pb, Cu. Ag, Sn) the thermal expansion effect gives a temperature coefficient dv/dT of the work function of either sign depending on the metal and the plane. The effect of atomic vibrations is calculated by taking into account the smearing in pseudo-potential core radius caused by vibrations. The absolute value of the calculated total temperature coefficient increases with decreasing packing density in the planes. The computed coefficients are in qualitative agreement with the measured ones.
Surface Science 178 (1986) 342-348 North-Holland, Amsterdam
SPIN-POLARIZED ANGLE-RESOLVED PHOTOEMISSION FROM THE (110) SURFACE OF PLATINUM
J. GARBE, D. VENUS, S. SUGA *, C. SCHNEIDER
and J. KIRSCHNER
Institut firr Grenrflijchenforschung und Vakuumphysik, Kernforschungsanlage Jiilich. Postfach 1913, D-51 70 Jiilich, Fed. Rep. of Germon_v Received
17 March
1986; accepted
for publication
2
June 19%
Spin-polarized, angle-resolved photoemission experiments in normal emission from the reconstructed (110) surface of platinum have been performed with circularly polarized synchrotron radiation from the Berlin storage ring BESSY. Along the (110) direction direct transitions with a non-zero spin polarization are only expected if there is considerable hybridization between certain single-group representations in either the initial- or the final-state bands. Our results show spin-polarization values of up to 30% and most of the peaks in the spectra can be understood in terms of direct bulk transitions. The spin-polarization data provide information about the hybridization of the initial states along the (110) direction.
349
Surface Science 178 (1986) 349-358 North-Holland, Amsterdam
ON THE TEMPERATURE
DEPENDENCE
OF THE WORK FUNCTION
A. KIEJNA Institute of Experimental Physics, University of Wrocfaw, ul. Cybulskiego 36, 50-205 Wroclaw, Poland Received
10 March
86; accepted
for publication
16 June 86
The influence of thermal expansion and atomic vibrations on the temperature dependence of the metal work function is analyzed. For the low-index planes of the group of metals considered (Li, Na, Al, Pb, Cu. Ag, Sn) the thermal expansion effect gives a temperature coefficient dv/dT of the work function of either sign depending on the metal and the plane. The effect of atomic vibrations is calculated by taking into account the smearing in pseudo-potential core radius caused by vibrations. The absolute value of the calculated total temperature coefficient increases with decreasing packing density in the planes. The computed coefficients are in qualitative agreement with the measured ones.