JMSSJ On-line, Vol. 52 (2004) No. 1, pp. 45-50
Determination of H2O Pattern Coeffcients for Temperature Programmed Desorption Mass Spectrometry
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    Satoko TOKIWA, Toshikazu NISHIDE, Akio HASHIZUME, and Nobuyoshi MIYABAYASHI

    a)Worldwide Research Center for Advanced Engineeirng &Technology, College of Engineering, Nihon University(Tamura, Koriyama 963-8642, Japan),*b)Department of Materials Chemistry and Engineering, College of Engineering, Nihon University (Tamura, Koriyama 963-8642, Japan.c)ESCO Ltd. (Nishikubo, Musashino, Tokyo 180-0013, Japan)
Pattern coefficients (PC) of H2O using temperature programmed desorption mass spectrometry (TPDMS) were determined by using TPD curves of m/z 1, 16, 17, and 18 generated from H2O adsorbed on silica gels. TPD curves of m/z 1, 16, 17, and 18, which corresponded to H2O and its fragments were obtained by a quadrupole mass spectrometer (QMS) equipped with the TPDMS apparatus. The H2O pattern coefficients for m/z 1, 16, 17, and 18 were determined to be 16.8, 2.12, 26.4, and 100, respectively. The values were different from those supplied by QMS company especially for m/z 1. Our PC data determined for the TPDMS reasonably explain the TPD curves for CaC2O4·H2O.
Key words: Temperature programmed desorption, Pattern coeffcient, TPDMS apparatus, H2O, m/z 1
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