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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 C4H9OH, H2O and C2H5OH was measured on the aluminum (6063-T1) vacuum chamber. The adsorption energy of these gases, estimated from measured mean sojourn time and to τ0=10-13 sec, are a little larger than the vaporization energy of them.

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