The damping behavior of field emission (FE) currents was monitored with W(111) tips under pressures down to 5× 10-10 Pa. Semilogarithmic damping curves of FE currents were linear for 0.3 L hydrogen exposure in the thoroughly degassed extreme high vacuum (XHV) FE system. The slope of semilogarithmic damping curves was linearly proportional to the operation pressure, suggesting a method of measuring pressure in an XHV range. Electron stimulated desorption was not observed.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)