The damping behavior of field emission (FE) currents was monitored with W(111) tips under pressures down to 5×1010Pa. Semilogarithmic damping curves of FE currents were linear for 0.3L 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.

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