Work function or ionization potential measurement equipment and its manner

摘要

PROBLEM TO BE SOLVED: To accurately measure the work function or ionization potential of a sample. SOLUTION: The ultraviolet ray from a heavy hydrogen lamp 1 is disided with a spectroscope 2, and poured on a sample 5. The photoelectron that occurred is detected with a photomultiplier 13. Based on such wavelength (energy) with which discharge of photoelectron from the sample 5 starts, a work function or ionization potential is obtained. Here, by fixing of electric potential of a sample with a DC power source 11, adjustment of a position of sample 5 with a goniometer 9, and adjustment of irradiated ultraviolet ray intensity with an ND filter 8, etc., the absorption current of a sample measured with a minute ampere meter is kept constant, so that the sample is prevented from charged up for measurement of accurate work function or ionization potential.