August 1, 2011.
Many materials outgas as they are heated in a vacuum, compromising a sealed vacuum if they cannot be gettered. Our goal is to be able to identify which molecules are emitted and at what temperature. Determining specific species from the fragments produced in the mass spectrometer is extremely difficult since there is always more than one species outgassed at any time. We have chosen to use PCA because it has been used previously with mass spectral data. The commercial PCA software we used was unable to separate the spectra into pure, or almost pure, species. Other strategies for interpreting the data are suggested.
Physical Sciences and Mathematics
Sandia National Laboratory/California (SNL)
This material is based upon work supported by the S.D. Bechtel, Jr. Foundation and by the National Science Foundation under Grant No. 0952013. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the S.D. Bechtel, Jr. Foundation or the National Science Foundation.