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The temperature-programmed desorption spectra (TPDS) of water molecules on solid surfaces can be accurately obtained by the direct measurement of the flux density of molecules desorbed from the surfaces. For this purpose, the ion source of the quadrupole mass spectrometer (QMS) was covered by Cu envelope with collimator cooled by liquid nitrogen, and the sample surface was placed just in front of the collimator. The change of the saturation vapor pressure with the phase transition of ice from amorphous to crystalline form was observed by this method. The calibration of the QMS ion current for the rate of desorption of water molecules has been made use of the saturation vapor pressure of crystalline ice.

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Measurement of the Thermal Desorption Spectra of Water Molecules by an Unidirectional Mass Spectrometer: Calibration of the Sensitivity of Mass Spectrometer.