A new measurement method of the mean sojourn time of molecules on the surfaces of practical vacuum systems was tested. In a vacuum system, if an adsorbed phase is equilibrated with a gas phase, mean sojourn time can be obtained from measured time constant of evacuation and geometrical time constant (
V/
S) of the vacuum system.
Mean sojourn time of C
4H
9OH, H
2O and C
2H
5OH was measured on the aluminum (6063-T1) vacuum chamber. The adsorption energy of these gases, estimated from measured mean sojourn time and to τ
0=10
-13 sec, are a little larger than the vaporization energy of them.
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